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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1705.05482 | Pavel Krtous | Valeri P. Frolov, Pavel Krtous, David Kubiznak | Black holes, hidden symmetries, and complete integrability | The review paper, 217 pages, 7 figures. [v3: chapters 1-3 and
appendices rearranged and extensively modified, references added] | Living Rev Relativ (2017) 20:6 | 10.1007/s41114-017-0009-9 | null | gr-qc hep-th math-ph math.MP nlin.SI | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The study of higher-dimensional black holes is a subject which has recently
attracted a vast interest. Perhaps one of the most surprising discoveries is a
realization that the properties of higher-dimensional black holes with the
spherical horizon topology and described by the Kerr-NUT-(A)dS metrics are very
similar ... | [
{
"created": "Mon, 15 May 2017 23:38:24 GMT",
"version": "v1"
},
{
"created": "Thu, 25 May 2017 23:21:19 GMT",
"version": "v2"
},
{
"created": "Wed, 22 Nov 2017 23:51:18 GMT",
"version": "v3"
}
] | 2018-05-24 | [
[
"Frolov",
"Valeri P.",
""
],
[
"Krtous",
"Pavel",
""
],
[
"Kubiznak",
"David",
""
]
] | The study of higher-dimensional black holes is a subject which has recently attracted a vast interest. Perhaps one of the most surprising discoveries is a realization that the properties of higher-dimensional black holes with the spherical horizon topology and described by the Kerr-NUT-(A)dS metrics are very similar to... |
2303.03104 | Paulo Luz | Paulo Luz and Jos\'e P. S. Lemos | Relativistic cosmology and intrinsic spin of matter: Results and
theorems in Einstein-Cartan theory | 43 pages | Physical Review D 107, 084004 (2023) | 10.1103/PhysRevD.107.084004 | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | We start by presenting the general set of structure equations for the 1+3
threading spacetime decomposition in 4 spacetime dimensions, valid for any
theory of gravitation based on a metric compatible affine connection. We then
apply these equations to the study of cosmological solutions of the
Einstein-Cartan theory ... | [
{
"created": "Thu, 2 Mar 2023 19:00:04 GMT",
"version": "v1"
}
] | 2023-04-18 | [
[
"Luz",
"Paulo",
""
],
[
"Lemos",
"José P. S.",
""
]
] | We start by presenting the general set of structure equations for the 1+3 threading spacetime decomposition in 4 spacetime dimensions, valid for any theory of gravitation based on a metric compatible affine connection. We then apply these equations to the study of cosmological solutions of the Einstein-Cartan theory in... |
gr-qc/9801090 | James E. Lidsey | James E. Lidsey and J. Maharana | Dualities and Hidden Supersymmetry in String Quantum Cosmology | 18 pages, plain Latex, no figures | null | null | CERN-TH/98-22 | gr-qc hep-th | null | A supersymmetric approach to string quantum cosmology based on the
non-compact, global duality symmetries of the effective action is developed. An
N=2 supersymmetric action is derived whose bosonic component is the
Neveu-Schwarz/Neveu-Schwarz sector of the $(d+1)$--dimensional effective action
compactified on a $d$--... | [
{
"created": "Tue, 27 Jan 1998 13:32:41 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Lidsey",
"James E.",
""
],
[
"Maharana",
"J.",
""
]
] | A supersymmetric approach to string quantum cosmology based on the non-compact, global duality symmetries of the effective action is developed. An N=2 supersymmetric action is derived whose bosonic component is the Neveu-Schwarz/Neveu-Schwarz sector of the $(d+1)$--dimensional effective action compactified on a $d$--to... |
1402.3252 | John F. Donoghue | John F. Donoghue and Basem Kamal El-Menoufi | Non-local quantum effects in cosmology 1: Quantum memory, non-local FLRW
equations and singularity avoidance | 18 pages, 13 figures - extra references added and minor wording
changes | Phys. Rev. D 89, 104062 (2014) | 10.1103/PhysRevD.89.104062 | ACFI-T14-004 | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss cosmological effects of the quantum loops of massless particles,
which lead to temporal non-localities in the equations of motion governing the
scale factor a(t). For the effects discussed here, loops cause the evolution of
a(t) to depend on the memory of the curvature in the past with a weight that
scales... | [
{
"created": "Thu, 13 Feb 2014 19:06:23 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Mar 2014 17:57:55 GMT",
"version": "v2"
}
] | 2014-06-11 | [
[
"Donoghue",
"John F.",
""
],
[
"El-Menoufi",
"Basem Kamal",
""
]
] | We discuss cosmological effects of the quantum loops of massless particles, which lead to temporal non-localities in the equations of motion governing the scale factor a(t). For the effects discussed here, loops cause the evolution of a(t) to depend on the memory of the curvature in the past with a weight that scales i... |
2104.01191 | Toby Ord | Toby Ord | The Edges of Our Universe | 45 pages, 16 figures | null | null | null | gr-qc hep-th physics.hist-ph | http://creativecommons.org/licenses/by-nc-nd/4.0/ | This paper explores the fundamental causal limits on how much of the universe
we can observe or affect. It distinguishes four principal regions: the
affectable universe, the observable universe, the eventually observable
universe, and the ultimately observable universe. It then shows how these (and
other) causal limi... | [
{
"created": "Fri, 2 Apr 2021 18:29:41 GMT",
"version": "v1"
},
{
"created": "Wed, 5 May 2021 14:41:13 GMT",
"version": "v2"
}
] | 2021-05-06 | [
[
"Ord",
"Toby",
""
]
] | This paper explores the fundamental causal limits on how much of the universe we can observe or affect. It distinguishes four principal regions: the affectable universe, the observable universe, the eventually observable universe, and the ultimately observable universe. It then shows how these (and other) causal limits... |
2107.11616 | Junji Jia | Zixiao Li, Haotian Liu and Junji Jia | Deflection and gravitational lensing of null and timelike signals in
general asymptotically (anti-)de Sitter spacetimes | 20 pages, 5 figures | Phys. Rev. D 104, 084027 (2021) | 10.1103/PhysRevD.104.084027 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The deflection and gravitational lensing of light and massive particles in
arbitrary static, spherically symmetric and asymptotically (anti-)de Sitter
spacetimes are considered in this work. We first proved that for spacetimes
whose metric satisfying certain conditions, the deflection of null rays with
fixed closest ... | [
{
"created": "Sat, 24 Jul 2021 14:11:09 GMT",
"version": "v1"
}
] | 2021-10-13 | [
[
"Li",
"Zixiao",
""
],
[
"Liu",
"Haotian",
""
],
[
"Jia",
"Junji",
""
]
] | The deflection and gravitational lensing of light and massive particles in arbitrary static, spherically symmetric and asymptotically (anti-)de Sitter spacetimes are considered in this work. We first proved that for spacetimes whose metric satisfying certain conditions, the deflection of null rays with fixed closest di... |
gr-qc/9912063 | Cenalo Vaz | T. P. Singh (Tata Institute, Mumbai) and Cenalo Vaz (Univ. Algarve,
Portugal) | Quantum Radiation from Black Holes and Naked Singularities in Spherical
Dust Collapse | PHYZZX macros, 27 pages, 3 figures | Phys.Rev. D61 (2000) 124005 | 10.1103/PhysRevD.61.124005 | UATP-99/04 | gr-qc hep-th | null | A sufficiently massive collapsing star will end its life as a spacetime
singularity. The nature of the Hawking radiation emitted during collapse
depends critically on whether the star's boundary conditions are such as would
lead to the eventual formation of a black hole or, alternatively, to the
formation of a naked ... | [
{
"created": "Wed, 15 Dec 1999 13:58:54 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Singh",
"T. P.",
"",
"Tata Institute, Mumbai"
],
[
"Vaz",
"Cenalo",
"",
"Univ. Algarve,\n Portugal"
]
] | A sufficiently massive collapsing star will end its life as a spacetime singularity. The nature of the Hawking radiation emitted during collapse depends critically on whether the star's boundary conditions are such as would lead to the eventual formation of a black hole or, alternatively, to the formation of a naked si... |
1006.3529 | Paul Wesson | Paul S. Wesson | Physical Identifications for the Algebraic Quantities of
Five-Dimensional Relativity | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When four-dimensional general relativity is embedded in an unconstrained
man-ner in a fifth dimension, the physical quantities of spacetime can be
interpreted as geometrical properties related to the extra dimension. It has
become widespread to view the ten Einstein equations and the source terms of
the energy-moment... | [
{
"created": "Thu, 17 Jun 2010 17:28:39 GMT",
"version": "v1"
}
] | 2010-06-18 | [
[
"Wesson",
"Paul S.",
""
]
] | When four-dimensional general relativity is embedded in an unconstrained man-ner in a fifth dimension, the physical quantities of spacetime can be interpreted as geometrical properties related to the extra dimension. It has become widespread to view the ten Einstein equations and the source terms of the energy-momentum... |
gr-qc/0409049 | Irina Dymnikova | Irina Dymnikova and Evgeny Galaktionov | Stability of a vacuum nonsingular black hole | 18 pages, 8 figures, submitted to "Classical and Quantum Gravity" | Class.Quant.Grav. 22 (2005) 2331-2358 | 10.1088/0264-9381/22/12/003 | null | gr-qc | null | This is the first of series of papers in which we investigate stability of
the spherically symmetric space-time with de Sitter center. Geometry,
asymptotically Schwarzschild for large $r$ and asymptotically de Sitter as
$r\to 0$, describes a vacuum nonsingular black hole for $m\geq m_{cr}$ and
particle-like self-grav... | [
{
"created": "Sun, 12 Sep 2004 14:49:10 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Dymnikova",
"Irina",
""
],
[
"Galaktionov",
"Evgeny",
""
]
] | This is the first of series of papers in which we investigate stability of the spherically symmetric space-time with de Sitter center. Geometry, asymptotically Schwarzschild for large $r$ and asymptotically de Sitter as $r\to 0$, describes a vacuum nonsingular black hole for $m\geq m_{cr}$ and particle-like self-gravit... |
2307.13249 | Cosimo Bambi | Cosimo Bambi | Regular Black Holes: Towards a New Paradigm of Gravitational Collapse | 4 pages, no figures. Preface and table of contents of the book
"Regular Black Holes: Towards a New Paradigm of Gravitational Collapse"
(Springer Singapore, 2023). ISBN: 978-981-99-1595-8 (Hardcover),
978-981-99-1596-5 (eBook) | null | 10.1007/978-981-99-1596-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Black holes are one of the most fascinating predictions of general
relativity. They are the natural product of the complete gravitational collapse
of matter and today we have a body of observational evidence supporting the
existence of black holes in the Universe. However, general relativity predicts
that at the cent... | [
{
"created": "Tue, 25 Jul 2023 04:38:22 GMT",
"version": "v1"
}
] | 2023-07-26 | [
[
"Bambi",
"Cosimo",
""
]
] | Black holes are one of the most fascinating predictions of general relativity. They are the natural product of the complete gravitational collapse of matter and today we have a body of observational evidence supporting the existence of black holes in the Universe. However, general relativity predicts that at the center... |
2206.09518 | Xin Wu | Wenfu Cao, Wenfang Liu and Xin Wu | Integrability of Kerr-Newman spacetime with cloud strings, quintessence
and electromagnetic field | 14 pages, 5 figures and 2 tables | Physical Review D 105, 124039 (2022) | 10.1103/PhysRevD.105.124039 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The dynamics of charged particles moving around a Kerr-Newman black hole
surrounded by cloud strings, quintessence and electromagnetic field is
integrable due to the presence of a fourth constant of motion like the Carter
constant. The fourth motion constant and the axial-symmetry of the spacetime
give a chance to th... | [
{
"created": "Mon, 20 Jun 2022 00:38:49 GMT",
"version": "v1"
}
] | 2022-06-22 | [
[
"Cao",
"Wenfu",
""
],
[
"Liu",
"Wenfang",
""
],
[
"Wu",
"Xin",
""
]
] | The dynamics of charged particles moving around a Kerr-Newman black hole surrounded by cloud strings, quintessence and electromagnetic field is integrable due to the presence of a fourth constant of motion like the Carter constant. The fourth motion constant and the axial-symmetry of the spacetime give a chance to the ... |
2004.02261 | Dao-Jun Liu | Xing-Hua Jin, Yuan-Xing Gao and Dao-Jun Liu | Strong gravitational lensing of a 4-dimensional Einstein-Gauss-Bonnet
black hole in homogeneous plasma | 16 pages, 7 figures; v2: references added, words polished and some
typos corrected; v3: version to appear in IJMPD | null | 10.1142/S0218271820500650 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the strong gravitational lensing of spherically symmetric
black holes in the novel Einstein-Gauss-Bonnet(EGB) gravity surrounded by
unmagnetised plasma medium. The deflection angle in the strong deflection limit
in EGB spacetime with homogeneous plasma is derived. We find that both the
coupling constan... | [
{
"created": "Sun, 5 Apr 2020 17:31:34 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Apr 2020 05:27:52 GMT",
"version": "v2"
},
{
"created": "Tue, 30 Jun 2020 06:53:44 GMT",
"version": "v3"
}
] | 2020-08-26 | [
[
"Jin",
"Xing-Hua",
""
],
[
"Gao",
"Yuan-Xing",
""
],
[
"Liu",
"Dao-Jun",
""
]
] | We investigate the strong gravitational lensing of spherically symmetric black holes in the novel Einstein-Gauss-Bonnet(EGB) gravity surrounded by unmagnetised plasma medium. The deflection angle in the strong deflection limit in EGB spacetime with homogeneous plasma is derived. We find that both the coupling constant ... |
gr-qc/9506063 | Gilles Esposito-Farese | Thibault Damour and Gilles Esposito-Farese | Testing gravity to second post-Newtonian order: a field-theory approach | 63 pages, 11 figures.ps.tar.gz.uu, REVTeX 3.0 | Phys.Rev.D53:5541-5578,1996 | 10.1103/PhysRevD.53.5541 | IHES/P/95/57 and CPT-95/P.3167 | gr-qc | null | A new, field-theory-based framework for discussing and interpreting tests of
gravity, notably at the second post-Newtonian (2PN) level, is introduced.
Contrary to previous frameworks which attempted at parametrizing any
conceivable deviation from general relativity, we focus on the best motivated
class of models, in ... | [
{
"created": "Tue, 27 Jun 1995 19:05:20 GMT",
"version": "v1"
}
] | 2011-09-09 | [
[
"Damour",
"Thibault",
""
],
[
"Esposito-Farese",
"Gilles",
""
]
] | A new, field-theory-based framework for discussing and interpreting tests of gravity, notably at the second post-Newtonian (2PN) level, is introduced. Contrary to previous frameworks which attempted at parametrizing any conceivable deviation from general relativity, we focus on the best motivated class of models, in wh... |
1704.07786 | Sergey Chervon | Igor V. Fomin and Sergey V. Chervon | A new approach to exact solutions construction in scalar cosmology with
a Gauss-Bonnet term | 12 pages, 1 figure | Modern Physics Letters A, Vol.32, No.25 (2017) 1750129 (14 pages) | 10.1142/S0217732317501292 | LGCA2017/CH2; LMME2017/F2 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the cosmological model based on Einstein-Gauss-Bonnet gravity with
non-minimal coupling of a scalar field to a Gauss-Bonnet term in 4D Friedmann
universe. We show how constructing the exact solutions by the method based on a
confrontation of the Hubble parameter in the model under consideration with
that in ... | [
{
"created": "Tue, 25 Apr 2017 17:00:32 GMT",
"version": "v1"
}
] | 2017-07-26 | [
[
"Fomin",
"Igor V.",
""
],
[
"Chervon",
"Sergey V.",
""
]
] | We study the cosmological model based on Einstein-Gauss-Bonnet gravity with non-minimal coupling of a scalar field to a Gauss-Bonnet term in 4D Friedmann universe. We show how constructing the exact solutions by the method based on a confrontation of the Hubble parameter in the model under consideration with that in a ... |
2107.02449 | Stefan Czimek | Stefanos Aretakis, Stefan Czimek, Igor Rodnianski | The characteristic gluing problem for the Einstein vacuum equations.
Linear and non-linear analysis | 102 pages, 11 figures | null | null | null | gr-qc math-ph math.AP math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is the second paper in a series of papers adressing the characteristic
gluing problem for the Einstein vacuum equations. We solve the codimension-$10$
characteristic gluing problem for characteristic data which are close to the
Minkowski data. We derive an infinite-dimensional space of gauge-dependent
charges an... | [
{
"created": "Tue, 6 Jul 2021 07:54:40 GMT",
"version": "v1"
}
] | 2021-07-07 | [
[
"Aretakis",
"Stefanos",
""
],
[
"Czimek",
"Stefan",
""
],
[
"Rodnianski",
"Igor",
""
]
] | This is the second paper in a series of papers adressing the characteristic gluing problem for the Einstein vacuum equations. We solve the codimension-$10$ characteristic gluing problem for characteristic data which are close to the Minkowski data. We derive an infinite-dimensional space of gauge-dependent charges and ... |
2212.02572 | Geraint Pratten | Geraint Pratten, Antoine Klein, Christopher J. Moore, Hannah
Middleton, Nathan Steinle, Patricia Schmidt, Alberto Vecchio | On the LISA science performance in observations of short-lived signals
from massive black hole binary coalescences | 13 pages, 6 figures, comments welcome! | null | 10.1103/PhysRevD.107.123026 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | The observation of massive black hole binary systems is one of the main
science objectives of the Laser Interferometer Space Antenna (LISA). The
instrument's design requirements have recently been revised: they set a
requirement at $0.1\,\mathrm{mHz}$, with no additional explicit requirements at
lower frequencies. Th... | [
{
"created": "Mon, 5 Dec 2022 19:51:48 GMT",
"version": "v1"
}
] | 2023-07-05 | [
[
"Pratten",
"Geraint",
""
],
[
"Klein",
"Antoine",
""
],
[
"Moore",
"Christopher J.",
""
],
[
"Middleton",
"Hannah",
""
],
[
"Steinle",
"Nathan",
""
],
[
"Schmidt",
"Patricia",
""
],
[
"Vecchio",
"Alberto",
... | The observation of massive black hole binary systems is one of the main science objectives of the Laser Interferometer Space Antenna (LISA). The instrument's design requirements have recently been revised: they set a requirement at $0.1\,\mathrm{mHz}$, with no additional explicit requirements at lower frequencies. This... |
2008.05696 | Ming Zhang | Ming Zhang and Jie Jiang | Revisiting collisional Penrose processes in term of escape probabilities
for spinning particles | 7 pages, 4 captioned figures, PRD accepted | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by-sa/4.0/ | We first study the escape probability of the spinning particle emitted from
the Kerr black hole and find that the escape probability increases with the
spin of the particle around the extreme Kerr black hole; in contrast, the
escape probability decreases at the position near the horizon but increases at
the position ... | [
{
"created": "Thu, 13 Aug 2020 05:39:09 GMT",
"version": "v1"
}
] | 2020-08-14 | [
[
"Zhang",
"Ming",
""
],
[
"Jiang",
"Jie",
""
]
] | We first study the escape probability of the spinning particle emitted from the Kerr black hole and find that the escape probability increases with the spin of the particle around the extreme Kerr black hole; in contrast, the escape probability decreases at the position near the horizon but increases at the position fa... |
0801.1734 | Brandon DiNunno | Brandon S. DiNunno and Richard A. Matzner | The Volume Inside a Black Hole | 17 pages, 5 figures | Gen.Rel.Grav.42:63-76,2010 | 10.1007/s10714-009-0814-x | null | gr-qc | null | The horizon (the surface) of a black hole is a null surface, defined by those
hypothetical "outgoing" light rays that just hover under the influence of the
strong gravity at the surface. Because the light rays are orthogonal to the
spatial 2-dimensional surface at one instant of time, the surface of the black
hole is... | [
{
"created": "Fri, 11 Jan 2008 08:44:01 GMT",
"version": "v1"
}
] | 2010-01-04 | [
[
"DiNunno",
"Brandon S.",
""
],
[
"Matzner",
"Richard A.",
""
]
] | The horizon (the surface) of a black hole is a null surface, defined by those hypothetical "outgoing" light rays that just hover under the influence of the strong gravity at the surface. Because the light rays are orthogonal to the spatial 2-dimensional surface at one instant of time, the surface of the black hole is t... |
gr-qc/0506036 | S. Mignemi | S. Mignemi | A spacetime realization of kappa-Poincare algebra | 5 pages, plain TeX. Some misprints corrected. A discussion on the
possibility of experimental verifications added | Phys.Rev. D72 (2005) 087703 | 10.1103/PhysRevD.72.087703 | null | gr-qc | null | We study a Hamiltonian realization of the phase space of kappa-Poincare
algebra that yields a definition of velocity consistent with the deformed
Lorentz symmetry. We are also able to determine the laws of transformation of
spacetime coordinates and to define an invariant spacetime metric, and discuss
some possible e... | [
{
"created": "Mon, 6 Jun 2005 16:32:57 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Aug 2005 11:11:58 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Mignemi",
"S.",
""
]
] | We study a Hamiltonian realization of the phase space of kappa-Poincare algebra that yields a definition of velocity consistent with the deformed Lorentz symmetry. We are also able to determine the laws of transformation of spacetime coordinates and to define an invariant spacetime metric, and discuss some possible exp... |
1912.00677 | Fran\c{c}ois Staelens | Fran\c{c}ois Staelens, J\'er\'emy Rekier, Andr\'e F\"uzfa | Universality of the spherical collapse with respect to the matter type :
the case of a barotropic fluid with linear equation of state | 24 pages, 19 figures | Gen Relativ Gravit 53, 38 (2021) | 10.1007/s10714-021-02804-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the spherical collapse of an over-density of a barotropic fluid with
linear equation of state in a cosmological background. Fully relativistic
simulations are performed by using the Baumgarte-Shibata-Shapiro-Nakamura
formalism jointly with the Valencia formulation of the hydrodynamics. This
permits us to tes... | [
{
"created": "Mon, 2 Dec 2019 10:43:11 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Apr 2021 09:46:00 GMT",
"version": "v2"
}
] | 2021-04-15 | [
[
"Staelens",
"François",
""
],
[
"Rekier",
"Jérémy",
""
],
[
"Füzfa",
"André",
""
]
] | We study the spherical collapse of an over-density of a barotropic fluid with linear equation of state in a cosmological background. Fully relativistic simulations are performed by using the Baumgarte-Shibata-Shapiro-Nakamura formalism jointly with the Valencia formulation of the hydrodynamics. This permits us to test ... |
0812.1973 | Giampiero Esposito Dr. | Donato Bini, Giampiero Esposito, Roberto Valentino Montaquila | Solution of Maxwell's equations on a de Sitter background | 11 pages, 5 figures, Latex. The presentation has been improved, and
the title has been changed | Gen.Rel.Grav.42:51-61,2010 | 10.1007/s10714-009-0813-y | DSF-2008-29 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Maxwell equations for the electromagnetic potential, supplemented by the
Lorenz gauge condition, are decoupled and solved exactly in de Sitter
space-time studied in static spherical coordinates. There is no source besides
the background. One component of the vector field is expressed, in its radial
part, through ... | [
{
"created": "Wed, 10 Dec 2008 17:23:59 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Apr 2009 14:24:46 GMT",
"version": "v2"
}
] | 2009-12-17 | [
[
"Bini",
"Donato",
""
],
[
"Esposito",
"Giampiero",
""
],
[
"Montaquila",
"Roberto Valentino",
""
]
] | The Maxwell equations for the electromagnetic potential, supplemented by the Lorenz gauge condition, are decoupled and solved exactly in de Sitter space-time studied in static spherical coordinates. There is no source besides the background. One component of the vector field is expressed, in its radial part, through th... |
gr-qc/0703039 | Adamantios Stavridis | M. Vavoulidis, A. Stavridis, K.D. Kokkotas and H. Beyer | Torsional Oscillations of Slowly Rotating Relativistic Stars | 6 pages, 1 figure. Accepted for publication to MNRAS | Mon.Not.Roy.Astron.Soc.377:1553-1556,2007 | 10.1111/j.1365-2966.2007.11706.x | null | gr-qc astro-ph | null | We study the effects of rotation on the torsional modes of oscillating
relativistic stars with a solid crust. Earlier works in Newtonian theory
provided estimates of the rotational corrections for the torsional modes and
suggested that they should become CFS unstable, even for quite low rotation
rates. In this work, ... | [
{
"created": "Tue, 6 Mar 2007 14:22:04 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Vavoulidis",
"M.",
""
],
[
"Stavridis",
"A.",
""
],
[
"Kokkotas",
"K. D.",
""
],
[
"Beyer",
"H.",
""
]
] | We study the effects of rotation on the torsional modes of oscillating relativistic stars with a solid crust. Earlier works in Newtonian theory provided estimates of the rotational corrections for the torsional modes and suggested that they should become CFS unstable, even for quite low rotation rates. In this work, we... |
1309.7533 | Emilio Rub\'in de Celis | E. Rub\'in de Celis, O. P. Santill\'an and C. Simeone | Probing global aspects of a geometry by the self-force on a charge:
Spherical thin-shell wormholes | 17 pages, 4 figues | null | 10.1103/PhysRevD.88.124012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The self-interaction for a static point charge in the space-time of a
thin-shell wormhole constructed connecting two identical Schwarzschild
geometries is calculated in a series expansion. The electrostatic self-force is
evaluated numerically. It is found to be attractive towards the throat except
for some values of ... | [
{
"created": "Sun, 29 Sep 2013 04:33:32 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Nov 2013 00:29:53 GMT",
"version": "v2"
}
] | 2015-06-17 | [
[
"de Celis",
"E. Rubín",
""
],
[
"Santillán",
"O. P.",
""
],
[
"Simeone",
"C.",
""
]
] | The self-interaction for a static point charge in the space-time of a thin-shell wormhole constructed connecting two identical Schwarzschild geometries is calculated in a series expansion. The electrostatic self-force is evaluated numerically. It is found to be attractive towards the throat except for some values of th... |
gr-qc/0407015 | Oleg Teryaev | A.J. Silenko, O.V. Teryaev | Semiclassical limit for Dirac particles interacting with a gravitational
field | 8 pages, no figures; version to appear in Physical Review D | Phys.Rev. D71 (2005) 064016 | 10.1103/PhysRevD.71.064016 | null | gr-qc astro-ph hep-ph hep-th | null | The behavior of spin-1/2 particle in a weak static gravitational field is
considered. The Dirac Hamiltonian is diagonalized by the Foldy-Wouthuysen
transformation providing also the simple form for the momentum and spin
polarization operators. The operator equations of momentum and spin motion are
derived for a first... | [
{
"created": "Sun, 4 Jul 2004 16:45:03 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Jul 2004 12:44:20 GMT",
"version": "v2"
},
{
"created": "Sun, 27 Feb 2005 18:02:26 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Silenko",
"A. J.",
""
],
[
"Teryaev",
"O. V.",
""
]
] | The behavior of spin-1/2 particle in a weak static gravitational field is considered. The Dirac Hamiltonian is diagonalized by the Foldy-Wouthuysen transformation providing also the simple form for the momentum and spin polarization operators. The operator equations of momentum and spin motion are derived for a first t... |
2401.05253 | Albachiara Cogo | Stefano Borghini, Carla Cederbaum, Albachiara Cogo | Black Hole and Equipotential Photon Surface Uniqueness in 4-dimensional
Asymptotically Flat Electrostatic Electro-Vacuum Spacetimes | 63 pages | null | null | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study 4-dimensional asymptotically flat electrostatic electro-vacuum
spacetimes with a connected black hole, photon sphere, or equipotential photon
surface inner boundary. Our analysis, inspired by the potential theory approach
by Agostiniani-Mazzieri, allows to give self-contained proofs of known
uniqueness theor... | [
{
"created": "Wed, 10 Jan 2024 16:32:01 GMT",
"version": "v1"
}
] | 2024-01-11 | [
[
"Borghini",
"Stefano",
""
],
[
"Cederbaum",
"Carla",
""
],
[
"Cogo",
"Albachiara",
""
]
] | We study 4-dimensional asymptotically flat electrostatic electro-vacuum spacetimes with a connected black hole, photon sphere, or equipotential photon surface inner boundary. Our analysis, inspired by the potential theory approach by Agostiniani-Mazzieri, allows to give self-contained proofs of known uniqueness theorem... |
1412.0105 | Samad Khakshournia | S. Khakshournia | A note on Pathria's model of the universe as a black hole | 5 pages | Grav.Cosmol.16:178-180,2010 | 10.1134/S0202289310020131 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Pathria has shown that for the certain values of the cosmological constant, a
pressureless closed Friedmann-Robertson-Walker universe can be the interior of
a Schwarzschild black hole. We examine the Pathria's model from the point of
view of the matching of the two different spacetimes through a null
hypersurface. We... | [
{
"created": "Sat, 29 Nov 2014 13:31:15 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Khakshournia",
"S.",
""
]
] | Pathria has shown that for the certain values of the cosmological constant, a pressureless closed Friedmann-Robertson-Walker universe can be the interior of a Schwarzschild black hole. We examine the Pathria's model from the point of view of the matching of the two different spacetimes through a null hypersurface. We f... |
1704.03372 | Andr\'es Gomberoff | Claudio Bunster and Andr\'es Gomberoff | Gravitational domain walls and the dynamics of $G$ | 8 pages, 2 figures | Phys. Rev. D 96, 025013 (2017) | 10.1103/PhysRevD.96.025013 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | From the point of view of elementary particle physics the gravitational
constant $G$ is extraordinarily small. This has led to ask whether it could
have decayed to its present value from an initial one commensurate with
microscopical units. A mechanism that leads to such a decay is proposed herein.
It is based on ass... | [
{
"created": "Tue, 11 Apr 2017 15:46:40 GMT",
"version": "v1"
}
] | 2017-07-26 | [
[
"Bunster",
"Claudio",
""
],
[
"Gomberoff",
"Andrés",
""
]
] | From the point of view of elementary particle physics the gravitational constant $G$ is extraordinarily small. This has led to ask whether it could have decayed to its present value from an initial one commensurate with microscopical units. A mechanism that leads to such a decay is proposed herein. It is based on assum... |
0812.4870 | Marie-Anne Bizouard | The Virgo Collaboration: F. Acernese, et al | Gravitational wave burst search in the Virgo C7 data | null | Class.Quant.Grav.26:085009,2009 | 10.1088/0264-9381/26/8/085009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A search for gravitational wave burst events has been performed with the
Virgo C7 commissioning run data that have been acquired in September 2005 over
five days. It focused on un-modeled short duration signals in the frequency
range 150 Hz to 2 kHz. A search aimed at detecting the GW emission from the
merger and rin... | [
{
"created": "Mon, 29 Dec 2008 04:22:02 GMT",
"version": "v1"
}
] | 2010-01-08 | [
[
"The Virgo Collaboration",
"",
""
],
[
"Acernese",
"F.",
""
]
] | A search for gravitational wave burst events has been performed with the Virgo C7 commissioning run data that have been acquired in September 2005 over five days. It focused on un-modeled short duration signals in the frequency range 150 Hz to 2 kHz. A search aimed at detecting the GW emission from the merger and ringd... |
1404.0589 | Gerard Clement | G\'erard Cl\'ement and Alessandro Fabbri | A scenario for critical scalar field collapse in $AdS_3$ | 19 pages, 3 figures, revised version to be published in Class. Quant.
Grav | Class. Quantum Grav. 32 (2015) 095009 | 10.1088/0264-9381/32/9/095009 | LAPTH-018/14 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a family of exact solutions, depending on two parameters $\alpha$
and $b$ (related to the scalar field strength), to the three-dimensional
Einstein-scalar field equations with negative cosmological constant $\Lambda$.
For $b=0$ these solutions reduce to the static BTZ family of vacuum solutions,
with mass ... | [
{
"created": "Wed, 2 Apr 2014 15:39:06 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Mar 2015 18:46:53 GMT",
"version": "v2"
}
] | 2016-02-25 | [
[
"Clément",
"Gérard",
""
],
[
"Fabbri",
"Alessandro",
""
]
] | We present a family of exact solutions, depending on two parameters $\alpha$ and $b$ (related to the scalar field strength), to the three-dimensional Einstein-scalar field equations with negative cosmological constant $\Lambda$. For $b=0$ these solutions reduce to the static BTZ family of vacuum solutions, with mass $M... |
0706.1157 | Albert V. Minkevich | A. V. Minkevich, A. S. Garkun and V. I. Kudin | Regular accelerating Universe without dark energy | 15 pages, 16 figures, iopart class file, some additions made | Class.Quant.Grav.24:5835-5848,2007 | 10.1088/0264-9381/24/23/007 | null | gr-qc | null | Homogeneous isotropic cosmological models with two torsion functions filled
with scalar fields and usual gravitating matter are built and investigated in
the framework of the Poincar\'e gauge theory of gravity. It is shown that by
certain restrictions on indefinite parameters of gravitational Lagrangian the
cosmologi... | [
{
"created": "Fri, 8 Jun 2007 11:06:49 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Oct 2007 07:27:28 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Minkevich",
"A. V.",
""
],
[
"Garkun",
"A. S.",
""
],
[
"Kudin",
"V. I.",
""
]
] | Homogeneous isotropic cosmological models with two torsion functions filled with scalar fields and usual gravitating matter are built and investigated in the framework of the Poincar\'e gauge theory of gravity. It is shown that by certain restrictions on indefinite parameters of gravitational Lagrangian the cosmologica... |
2308.02268 | Sergey Sushkov V | Valeria A. Ishkaeva, Sergey V. Sushkov | Image of an accreting general Ellis-Bronnikov wormhole | 11 pages, 6 figures, new references was added | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Gravitational lensing properties of supermassive astrophysical objects, such
as black holes and wormholes, provide the realistic way for their discovering
and investigating. Various lensing effects in a wormhole spacetime have been
widely studied in the literature. One of the most popular object for
investigation is ... | [
{
"created": "Fri, 4 Aug 2023 11:46:07 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Aug 2023 15:02:41 GMT",
"version": "v2"
}
] | 2023-08-10 | [
[
"Ishkaeva",
"Valeria A.",
""
],
[
"Sushkov",
"Sergey V.",
""
]
] | Gravitational lensing properties of supermassive astrophysical objects, such as black holes and wormholes, provide the realistic way for their discovering and investigating. Various lensing effects in a wormhole spacetime have been widely studied in the literature. One of the most popular object for investigation is th... |
1211.0200 | Yury F. Pirogov | Yu. F. Pirogov | Unimodular bimode gravity, grand unification and the scalar-graviton
dark matter | 4 pages | null | null | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In prior article of the author, the unimodular bimode gravity/systo-gravity,
with the scalar-graviton/systolon dark matter, was worked out. To compile with
the anomalous rotation curves of galaxies the scale of the local scale
violation in the theory was shown to be about 10^15 GeV. In this letter, to
naturally incor... | [
{
"created": "Thu, 1 Nov 2012 15:12:23 GMT",
"version": "v1"
}
] | 2012-11-02 | [
[
"Pirogov",
"Yu. F.",
""
]
] | In prior article of the author, the unimodular bimode gravity/systo-gravity, with the scalar-graviton/systolon dark matter, was worked out. To compile with the anomalous rotation curves of galaxies the scale of the local scale violation in the theory was shown to be about 10^15 GeV. In this letter, to naturally incorpo... |
gr-qc/9308015 | null | Arlen Anderson | The use of exp(iS[x]) in the sum over histories | 22 pages, Latex, Imperial-TP-92-93-46 | Phys.Rev. D49 (1994) 4049-4055 | 10.1103/PhysRevD.49.4049 | null | gr-qc hep-th | null | The use of $\sum \exp(iS[x])$ as the generic form for a sum over histories in
configuration space is discussed critically and placed in its proper context.
The standard derivation of the sum over paths by discretizing the paths is
reviewed, and it is shown that the form $\sum \exp(iS[x])$ is justified only
for Schrod... | [
{
"created": "Tue, 17 Aug 1993 08:40:43 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Anderson",
"Arlen",
""
]
] | The use of $\sum \exp(iS[x])$ as the generic form for a sum over histories in configuration space is discussed critically and placed in its proper context. The standard derivation of the sum over paths by discretizing the paths is reviewed, and it is shown that the form $\sum \exp(iS[x])$ is justified only for Schrodin... |
1711.10256 | Cosimo Bambi | Cosimo Bambi | Astrophysical Black Holes: A Compact Pedagogical Review | 17 pages, 8 figures. v3: refereed version | Annalen der Physik 530, 1700430 (2018) | 10.1002/andp.201700430 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Black holes are among the most extreme objects that can be found in the
Universe and an ideal laboratory for testing fundamental physics. This article
will briefly review the basic properties of black holes as expected from
general relativity, the main astronomical observations, and the leading
astrophysical techniqu... | [
{
"created": "Tue, 28 Nov 2017 12:40:40 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Jan 2018 12:21:15 GMT",
"version": "v2"
},
{
"created": "Wed, 31 Jan 2018 22:47:02 GMT",
"version": "v3"
}
] | 2018-05-07 | [
[
"Bambi",
"Cosimo",
""
]
] | Black holes are among the most extreme objects that can be found in the Universe and an ideal laboratory for testing fundamental physics. This article will briefly review the basic properties of black holes as expected from general relativity, the main astronomical observations, and the leading astrophysical techniques... |
0712.2593 | Pouria Pedram | P. Pedram, S. Jalalzadeh | Quantum cosmology with varying speed of light: canonical approach | 14 pages, 7 figures, to appear in Physics Letters B | Phys.Lett.B660:1-6,2008 | 10.1016/j.physletb.2007.11.098 | null | gr-qc | null | We investigate $(n+1)$--dimensional cosmology with varying speed of light.
After solving corresponding Wheeler-DeWitt equation, we obtain exact solutions
in both classical and quantum levels for ($c $--$\Lambda$)--dominated Universe.
We then construct the ``canonical'' wave packets which exhibit a good classical
and ... | [
{
"created": "Sun, 16 Dec 2007 20:48:44 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Pedram",
"P.",
""
],
[
"Jalalzadeh",
"S.",
""
]
] | We investigate $(n+1)$--dimensional cosmology with varying speed of light. After solving corresponding Wheeler-DeWitt equation, we obtain exact solutions in both classical and quantum levels for ($c $--$\Lambda$)--dominated Universe. We then construct the ``canonical'' wave packets which exhibit a good classical and qu... |
1108.3003 | Burkhard Kleihaus | Panagiota Kanti, Burkhard Kleihaus, Jutta Kunz | Wormholes in Dilatonic Einstein-Gauss-Bonnet Theory | updated version, published in PRL | Phys.Rev.Lett. 107 (2011) 271101 | 10.1103/PhysRevLett.107.271101 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct traversable wormholes in dilatonic Einstein-Gauss-Bonnet theory
in four spacetime dimensions, without needing any form of exotic matter. We
determine their domain of existence, and show that these wormholes satisfy a
generalised Smarr relation. We demonstrate linear stability with respect to
radial pertu... | [
{
"created": "Mon, 15 Aug 2011 14:17:16 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Mar 2012 10:10:07 GMT",
"version": "v2"
}
] | 2015-05-30 | [
[
"Kanti",
"Panagiota",
""
],
[
"Kleihaus",
"Burkhard",
""
],
[
"Kunz",
"Jutta",
""
]
] | We construct traversable wormholes in dilatonic Einstein-Gauss-Bonnet theory in four spacetime dimensions, without needing any form of exotic matter. We determine their domain of existence, and show that these wormholes satisfy a generalised Smarr relation. We demonstrate linear stability with respect to radial perturb... |
gr-qc/0204039 | Maeda Hideki | Hideki Maeda, Tomohiro Harada, Hideo Iguchi and Naoya Okuyama | No Go Theorem for Kinematic Self-Similarity with A Polytropic Equation
of State | 5 pages, no figures. Revtex. One word added to the title. Final
version to appear in Physical Review D as a Brief Report | Phys.Rev. D66 (2002) 027501 | 10.1103/PhysRevD.66.027501 | WU-AP/143/02 | gr-qc | null | We have investigated spherically symmetric spacetimes which contain a perfect
fluid obeying the polytropic equation of state and admit a kinematic
self-similar vector of the second kind which is neither parallel nor orthogonal
to the fluid flow. We have assumed two kinds of polytropic equations of state
and shown in ... | [
{
"created": "Wed, 10 Apr 2002 08:15:24 GMT",
"version": "v1"
},
{
"created": "Sat, 25 May 2002 21:09:32 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Maeda",
"Hideki",
""
],
[
"Harada",
"Tomohiro",
""
],
[
"Iguchi",
"Hideo",
""
],
[
"Okuyama",
"Naoya",
""
]
] | We have investigated spherically symmetric spacetimes which contain a perfect fluid obeying the polytropic equation of state and admit a kinematic self-similar vector of the second kind which is neither parallel nor orthogonal to the fluid flow. We have assumed two kinds of polytropic equations of state and shown in ge... |
gr-qc/9511079 | null | B. L. Hu | Statistical Mechanics and Quantum Cosmology | Essay published in 1990 Conference Proceedings is reprinted here with
no alteration nor reference update. It is antecedent to related reviews in
gr-qc/9302025, gr-qc/9403061, gr-qc/9511077 | null | null | University of Maryland Physics Preprint UMDPP 91-096 | gr-qc | null | Statistical mechanical concepts and processes such as decoherence,
correlation, and dissipation can prove to be of basic importance to
understanding some fundamental issues of quantum cosmology and theoretical
physics such as the choice of initial states, quantum to classical transition
and the emergence of time. Her... | [
{
"created": "Wed, 29 Nov 1995 03:42:33 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hu",
"B. L.",
""
]
] | Statistical mechanical concepts and processes such as decoherence, correlation, and dissipation can prove to be of basic importance to understanding some fundamental issues of quantum cosmology and theoretical physics such as the choice of initial states, quantum to classical transition and the emergence of time. Here ... |
1209.4842 | Giulio Caciotta | Giulio Caciotta and Tiziana Raparelli | Asymptotic Behaviour of Zero Mass spin 2 Fields propagating in the
external region of Kerr spacetime | 61 pages, no figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | After describing the inhomogeneous equation suitable to describe
W{\nu}{\mu}{\rho}{\sigma}, a solution of the linearized version of the full
quasilinear equation for the conformal part of the Riemann tensor connected to
the perturbations of the Kerr spacetime far from the origin, we find the right
decays we have to i... | [
{
"created": "Fri, 21 Sep 2012 15:16:29 GMT",
"version": "v1"
}
] | 2012-09-24 | [
[
"Caciotta",
"Giulio",
""
],
[
"Raparelli",
"Tiziana",
""
]
] | After describing the inhomogeneous equation suitable to describe W{\nu}{\mu}{\rho}{\sigma}, a solution of the linearized version of the full quasilinear equation for the conformal part of the Riemann tensor connected to the perturbations of the Kerr spacetime far from the origin, we find the right decays we have to imp... |
2302.03612 | Waleed Sherif | Hanno Sahlmann and Waleed Sherif | A Fock space structure for the diffeomorphism invariant Hilbert space of
loop quantum gravity and its applications | 26 pages, 5 figures | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Loop quantum gravity (LQG) is a quantization program for gravity based on the
principles of QFT and general covariance of general relativity. Quantum states
of LQG describe gravitational excitations based on graphs embedded in a spatial
slice of spacetime. We show that, under certain assumptions on the class of
diffe... | [
{
"created": "Tue, 7 Feb 2023 17:15:39 GMT",
"version": "v1"
}
] | 2023-02-08 | [
[
"Sahlmann",
"Hanno",
""
],
[
"Sherif",
"Waleed",
""
]
] | Loop quantum gravity (LQG) is a quantization program for gravity based on the principles of QFT and general covariance of general relativity. Quantum states of LQG describe gravitational excitations based on graphs embedded in a spatial slice of spacetime. We show that, under certain assumptions on the class of diffeom... |
1701.02703 | Killian Martineau | Killian Martineau, Aur\'elien Barrau and Susanne Schander | Detailed investigation of the duration of inflation in loop quantum
cosmology for a Bianchi-I universe with different inflaton potentials and
initial conditions | null | Phys. Rev. D 95, 083507 (2017) | 10.1103/PhysRevD.95.083507 | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There is a wide consensus on the correct dynamics of the background in loop
quantum cosmology. In this article we make a systematic investigation of the
duration of inflation by varying what we think to be the most important
"unknowns" of the model: the way to set initial conditions, the amount of shear
at the bounce... | [
{
"created": "Tue, 10 Jan 2017 17:43:09 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Mar 2017 15:00:33 GMT",
"version": "v2"
}
] | 2017-04-19 | [
[
"Martineau",
"Killian",
""
],
[
"Barrau",
"Aurélien",
""
],
[
"Schander",
"Susanne",
""
]
] | There is a wide consensus on the correct dynamics of the background in loop quantum cosmology. In this article we make a systematic investigation of the duration of inflation by varying what we think to be the most important "unknowns" of the model: the way to set initial conditions, the amount of shear at the bounce a... |
gr-qc/9809036 | Takashi. Torii | T. Torii, K. Meeda and M. Narita | No-scalar hair conjecture in asymptotic de-Sitter spacetime | 9 pages, 2 Postscript figures | Phys.Rev. D59 (1999) 064027 | 10.1103/PhysRevD.59.064027 | Tokyo Institute of Technology preprint TIT/HEP-403 | gr-qc | null | We discuss the no-hair conjecture in the presence of a cosmological constant.
For the firststep the real scalar field is considered as the matter field and
the spacetime is assumed to be static spherically symmetric. If the scalar
field is massless or has a convex potential such as a mass term, it is proved
that ther... | [
{
"created": "Wed, 9 Sep 1998 12:42:17 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Torii",
"T.",
""
],
[
"Meeda",
"K.",
""
],
[
"Narita",
"M.",
""
]
] | We discuss the no-hair conjecture in the presence of a cosmological constant. For the firststep the real scalar field is considered as the matter field and the spacetime is assumed to be static spherically symmetric. If the scalar field is massless or has a convex potential such as a mass term, it is proved that there ... |
1808.07988 | Yan Peng | Yan Peng | Hair distributions in noncommutative Einstein-Born-Infeld black holes | 11 pages, 4 figures | Nuclear Physics B 941(2019)1-10 | 10.1016/j.nuclphysb.2019.02.016 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study hair mass distributions in noncommutative Einstein-Born-Infeld hairy
black holes with non-zero cosmological constants. We find that the larger
noncommutative parameter makes the hair easier to condense in the near horizon
area. We also show that Hod's lower bound can be evaded in the noncommutative
gravity. ... | [
{
"created": "Fri, 24 Aug 2018 02:57:55 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Feb 2019 02:07:55 GMT",
"version": "v2"
}
] | 2019-02-25 | [
[
"Peng",
"Yan",
""
]
] | We study hair mass distributions in noncommutative Einstein-Born-Infeld hairy black holes with non-zero cosmological constants. We find that the larger noncommutative parameter makes the hair easier to condense in the near horizon area. We also show that Hod's lower bound can be evaded in the noncommutative gravity. Ho... |
2212.00164 | Gines Perez Teruel | Gin\'es R. P\'erez Teruel, Ksh. Newton Singh, Farook Rahaman, Tanmoy
Chowdhury | Possible existence of stable compact stars in
$\kappa(\mathcal{R},\mathcal{T})-$gravity | 15 pages, 9 figures | null | 10.1142/S0217751X22501949 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We present the first interior solutions representing compact stars in
$\kappa(\mathcal{R},\mathcal{T})$ gravity, by solving the modified field
equations in isotropic coordinates. Further, we have assumed the metric
potentials in Schwarzschild's form and a few parameters along with the
isotropic condition of pressure.... | [
{
"created": "Wed, 30 Nov 2022 23:25:53 GMT",
"version": "v1"
}
] | 2022-12-02 | [
[
"Teruel",
"Ginés R. Pérez",
""
],
[
"Singh",
"Ksh. Newton",
""
],
[
"Rahaman",
"Farook",
""
],
[
"Chowdhury",
"Tanmoy",
""
]
] | We present the first interior solutions representing compact stars in $\kappa(\mathcal{R},\mathcal{T})$ gravity, by solving the modified field equations in isotropic coordinates. Further, we have assumed the metric potentials in Schwarzschild's form and a few parameters along with the isotropic condition of pressure. F... |
0712.2667 | Yuri Pavlov | A. A. Grib and Yu. V. Pavlov | Do active galactic nuclei convert dark matter into visible particles? | LATEX, 5 pages, no figure | Mod.Phys.Lett.A23:1151-1159,2008 | 10.1142/S0217732308027072 | null | gr-qc astro-ph hep-ph | null | The hypothesis that dark matter consists of superheavy particles with the
mass close to the Grand Unification scale is investigated. These particles were
created from vacuum by the gravitation of the expanding Universe and their
decay led to the observable baryon charge. Some part of these particles with
the lifetime... | [
{
"created": "Mon, 17 Dec 2007 09:51:10 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Grib",
"A. A.",
""
],
[
"Pavlov",
"Yu. V.",
""
]
] | The hypothesis that dark matter consists of superheavy particles with the mass close to the Grand Unification scale is investigated. These particles were created from vacuum by the gravitation of the expanding Universe and their decay led to the observable baryon charge. Some part of these particles with the lifetime l... |
gr-qc/9909023 | Valery M. Koryukin | Valery Koryukin (Mari State Technical University) | New methods in the theory of gauge fields | 13 pages, submitted to Physical Review D | null | null | null | gr-qc | null | One of the fundamental problems of the theoretical physics is the search of
the axioms, which ought to be the basis for the one-valued construction of
Lagrangians of the relativistic fields. The creation of the gauge fields theory
was the great success in the solution of this problem. The gauge formalism
allowed to d... | [
{
"created": "Tue, 7 Sep 1999 06:40:16 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Jan 2000 16:55:00 GMT",
"version": "v2"
}
] | 2016-08-31 | [
[
"Koryukin",
"Valery",
"",
"Mari State Technical University"
]
] | One of the fundamental problems of the theoretical physics is the search of the axioms, which ought to be the basis for the one-valued construction of Lagrangians of the relativistic fields. The creation of the gauge fields theory was the great success in the solution of this problem. The gauge formalism allowed to der... |
2401.10479 | Roberto A. Sussman | Roberto A Sussman, Carlo Alberto Mantica, Luca Guido Molinari and
Sebasti\'an N\'ajera | Response to a critique of "Cotton Gravity" | Important corrections and extra arguments added. 5 pages, all typos
corrected | null | null | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | We address in this article the criticism in a recently submitted article by
Clement and Noiucer (arXiv:2312.17662 [gr-qc]) on "Cotton Gravity" (CG), a
gravity theory alternative to General Relativity. These authors claim that CG
is "not predictive" for producing "too many" spherically symmetric vacuum
solutions, whil... | [
{
"created": "Fri, 19 Jan 2024 04:03:31 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Jan 2024 19:51:47 GMT",
"version": "v2"
}
] | 2024-01-25 | [
[
"Sussman",
"Roberto A",
""
],
[
"Mantica",
"Carlo Alberto",
""
],
[
"Molinari",
"Luca Guido",
""
],
[
"Nájera",
"Sebastián",
""
]
] | We address in this article the criticism in a recently submitted article by Clement and Noiucer (arXiv:2312.17662 [gr-qc]) on "Cotton Gravity" (CG), a gravity theory alternative to General Relativity. These authors claim that CG is "not predictive" for producing "too many" spherically symmetric vacuum solutions, while ... |
2111.06561 | Rui Xu | Rui Xu, Yong Gao, and Lijing Shao | Neutron stars in massive scalar-Gauss-Bonnet gravity: Spherical
structure and time-independent perturbations | 21 pages, 9 figures | Phys. Rev. D 105, 024003 (2022) | 10.1103/PhysRevD.105.024003 | null | gr-qc physics.comp-ph | http://creativecommons.org/licenses/by-sa/4.0/ | The class of scalar-tensor theories with the scalar field coupling to the
Gauss-Bonnet invariant has drawn great interest since solutions of spontaneous
scalarization were found for black holes in these theories. We contribute to
the existing literature a detailed study of the spontaneously scalarized
neutron stars (... | [
{
"created": "Fri, 12 Nov 2021 04:29:47 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Dec 2021 04:33:29 GMT",
"version": "v2"
}
] | 2022-01-05 | [
[
"Xu",
"Rui",
""
],
[
"Gao",
"Yong",
""
],
[
"Shao",
"Lijing",
""
]
] | The class of scalar-tensor theories with the scalar field coupling to the Gauss-Bonnet invariant has drawn great interest since solutions of spontaneous scalarization were found for black holes in these theories. We contribute to the existing literature a detailed study of the spontaneously scalarized neutron stars (NS... |
1809.01458 | Robert van den Hoogen | R. J. van den Hoogen, A. A. Coley, B. Alhulaimi, S. Mohandas, E.
Knighton, and S. O'Neil | Kantowski-Sachs Einstein-Aether Scalar Field Cosmological Models | 28 pages, 10 figures, 3 tables, submitted to JCAP | 2018 J. Cosmol. Astropart. Phys. 2018 017 | 10.1088/1475-7516/2018/11/017 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A class of positive curvature spatially homogeneous but anisotropic
cosmological models within an Einstein-aether gravitational framework are
investigated. The matter source is assumed to be a scalar field which is
coupled to the expansion of the aether field through a generalized exponential
potential. The evolution... | [
{
"created": "Wed, 5 Sep 2018 12:39:07 GMT",
"version": "v1"
}
] | 2019-03-27 | [
[
"Hoogen",
"R. J. van den",
""
],
[
"Coley",
"A. A.",
""
],
[
"Alhulaimi",
"B.",
""
],
[
"Mohandas",
"S.",
""
],
[
"Knighton",
"E.",
""
],
[
"O'Neil",
"S.",
""
]
] | A class of positive curvature spatially homogeneous but anisotropic cosmological models within an Einstein-aether gravitational framework are investigated. The matter source is assumed to be a scalar field which is coupled to the expansion of the aether field through a generalized exponential potential. The evolution e... |
2012.03260 | Xuefeng Zhang | Bo-Bing Ye, Xuefeng Zhang, Ming-Yue Zhou, Yan Wang, Hui-Min Yuan,
Defeng Gu, Yanwei Ding, Jinxiu Zhang, Jianwei Mei, Jun Luo | Optimizing orbits for TianQin | null | Int. J. Mod. Phys. D 28, 09, 1950121 (2019) | 10.1142/S0218271819501219 | null | gr-qc astro-ph.IM | http://creativecommons.org/licenses/by/4.0/ | TianQin is a geocentric space-based gravitational-wave observatory mission
consisting of three drag-free controlled satellites in an equilateral triangle
with an orbital radius of $ 10^{5}$ km. The constellation faces the white-dwarf
binary RX J0806.3+1527 located slightly below the ecliptic plane, and is
subject to ... | [
{
"created": "Sun, 6 Dec 2020 13:26:21 GMT",
"version": "v1"
}
] | 2021-02-17 | [
[
"Ye",
"Bo-Bing",
""
],
[
"Zhang",
"Xuefeng",
""
],
[
"Zhou",
"Ming-Yue",
""
],
[
"Wang",
"Yan",
""
],
[
"Yuan",
"Hui-Min",
""
],
[
"Gu",
"Defeng",
""
],
[
"Ding",
"Yanwei",
""
],
[
"Zhang",
"Jin... | TianQin is a geocentric space-based gravitational-wave observatory mission consisting of three drag-free controlled satellites in an equilateral triangle with an orbital radius of $ 10^{5}$ km. The constellation faces the white-dwarf binary RX J0806.3+1527 located slightly below the ecliptic plane, and is subject to gr... |
gr-qc/9302011 | null | Lee Smolin | Finite, diffeomorphism invariant observables in quantum gravity | Latex, no figures, 30 pages, SU-GP-93/1-1 | Phys.Rev. D49 (1994) 4028-4040 | 10.1103/PhysRevD.49.4028 | null | gr-qc hep-th | null | Two sets of spatially diffeomorphism invariant operators are constructed in
the loop representation formulation of quantum gravity. This is done by
coupling general relativity to an anti- symmetric tensor gauge field and using
that field to pick out sets of surfaces, with boundaries, in the spatial three
manifold. Th... | [
{
"created": "Wed, 10 Feb 1993 12:33:00 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Smolin",
"Lee",
""
]
] | Two sets of spatially diffeomorphism invariant operators are constructed in the loop representation formulation of quantum gravity. This is done by coupling general relativity to an anti- symmetric tensor gauge field and using that field to pick out sets of surfaces, with boundaries, in the spatial three manifold. The ... |
gr-qc/0211056 | Kunimasa Yamada | Hisao Suzuki and Kunimasa Yamada | Analytic Evaluation of the Decay Rate for Accelerated Proton | 11 pages | Phys.Rev. D67 (2003) 065002 | 10.1103/PhysRevD.67.065002 | EPHOU 02-007 | gr-qc | null | We evaluate the decay rate of the uniformly accelerated proton. We obtain an
analytic expression for inverse beta decay process caused by the acceleration.
We evaluate the decay rate both from the inertial frame and from the
accelerated frame where we should consider thermal radiation by Unruh effect.
We explicitly c... | [
{
"created": "Fri, 15 Nov 2002 05:54:02 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Dec 2002 08:12:04 GMT",
"version": "v2"
},
{
"created": "Tue, 24 Dec 2002 08:34:10 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Suzuki",
"Hisao",
""
],
[
"Yamada",
"Kunimasa",
""
]
] | We evaluate the decay rate of the uniformly accelerated proton. We obtain an analytic expression for inverse beta decay process caused by the acceleration. We evaluate the decay rate both from the inertial frame and from the accelerated frame where we should consider thermal radiation by Unruh effect. We explicitly che... |
gr-qc/0503092 | Marco Alberici | Marco Alberici | Measures and metrics in uniform gravitational fields | revtex4, 13 pages, 6 figures. Description was symplified and few
formula were corrected. One bibliografy link was also corrected and footnote
5 (4 in the previous version) was completely rewritten | null | null | null | gr-qc physics.ed-ph | null | A partially alternative derivation of the expression for the time dilation
effect in a uniform static gravitational field is obtained by means of a
thought experiment in which rates of clocks at rest at different heights are
compared using as reference a clock bound to a free falling reference system
(FFRS). Derivati... | [
{
"created": "Mon, 21 Mar 2005 18:36:18 GMT",
"version": "v1"
},
{
"created": "Thu, 12 May 2005 16:10:32 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Alberici",
"Marco",
""
]
] | A partially alternative derivation of the expression for the time dilation effect in a uniform static gravitational field is obtained by means of a thought experiment in which rates of clocks at rest at different heights are compared using as reference a clock bound to a free falling reference system (FFRS). Derivation... |
1302.6860 | Alexander Kamenshchik | A. Kamenshchik and S. Manti | Classical and quantum Big Brake cosmology for scalar field and tachyonic
models | 8 pages, published in the Proceedings of the International conference
"Multiverse and Fundamental Cosmology: Multicosmofun '12", September 10-14,
Szczein, Poland edited by Mariusz P. Dabrowski, Adam Balcerzak, Tomasz
Denkiewicz | AIP Conf. Proc. 1514, 179-182 (2013) | 10.1063/1.4791751 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a relation between the cosmological singularities in classical and
quantum theory, comparing the classical and quantum dynamics in some models
possessing the Big Brake singularity - the model based on a scalar field and
two models based on a tachyon-pseudo-tachyon field . It is shown that the
effect of quant... | [
{
"created": "Wed, 27 Feb 2013 14:39:39 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Kamenshchik",
"A.",
""
],
[
"Manti",
"S.",
""
]
] | We study a relation between the cosmological singularities in classical and quantum theory, comparing the classical and quantum dynamics in some models possessing the Big Brake singularity - the model based on a scalar field and two models based on a tachyon-pseudo-tachyon field . It is shown that the effect of quantum... |
1812.02110 | Muxin Han | Muxin Han, Zichang Huang, Antonia Zipfel | Emergent 4-dimensional linearized gravity from spin foam model | 15+5 pages, 4 figures. V2 improves the presentation, and expands the
discussion on the geometrical correspondence of spinfoam large-j critical
points | Phys. Rev. D 100, 024060 (2019) | 10.1103/PhysRevD.100.024060 | null | gr-qc cond-mat.str-el hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spin Foam Models (SFMs) are covariant formulations of Loop Quantum Gravity
(LQG) in 4 dimensions. This work studies the perturbations of SFMs on a flat
background. It demonstrates for the first time that smooth curved spacetime
geometries satisfying Einstein equation can emerge from discrete SFMs under an
appropriate... | [
{
"created": "Wed, 5 Dec 2018 17:00:09 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Apr 2019 17:50:30 GMT",
"version": "v2"
}
] | 2019-08-07 | [
[
"Han",
"Muxin",
""
],
[
"Huang",
"Zichang",
""
],
[
"Zipfel",
"Antonia",
""
]
] | Spin Foam Models (SFMs) are covariant formulations of Loop Quantum Gravity (LQG) in 4 dimensions. This work studies the perturbations of SFMs on a flat background. It demonstrates for the first time that smooth curved spacetime geometries satisfying Einstein equation can emerge from discrete SFMs under an appropriate l... |
2306.08246 | Seema Satin | Seema Satin | Induced polar perturbations in relativistic stars with stochastic
effects in the dense matter at sub-hydro mesoscopic scales: A theoretical
probe at intermediate length scales | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A linear response relation between metric and fluid perturbations driven by a
background noise source is used as a framework for obtaining non-radial polar
perturbations in dense matter relativistic stars. The perturbations carry a
generalized stochastic nature as solutions to the classical Einstein-Langevin
equation... | [
{
"created": "Wed, 14 Jun 2023 05:18:48 GMT",
"version": "v1"
}
] | 2023-06-16 | [
[
"Satin",
"Seema",
""
]
] | A linear response relation between metric and fluid perturbations driven by a background noise source is used as a framework for obtaining non-radial polar perturbations in dense matter relativistic stars. The perturbations carry a generalized stochastic nature as solutions to the classical Einstein-Langevin equation w... |
gr-qc/0109097 | Andre Fuzfa | A. Fuzfa, J.M. Gerard, D. Lambert | The Lemaitre-Schwarzschild Problem Revisited | Final version as accepted by GR&G (to appear in vol. 34, september
2002) | Gen.Rel.Grav. 34 (2002) 1411-1422 | 10.1023/A:1020030919033 | null | gr-qc | null | The Lemaitre and Schwarzschild analytical solutions for a relativistic
spherical body of constant density are linked together through the use of the
Weyl quadratic invariant. The critical radius for gravitational collapse of an
incompressible fluid is shown to vary continuously from 9/8 of the
Schwarzschild radius to... | [
{
"created": "Fri, 28 Sep 2001 17:24:59 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Oct 2001 13:55:48 GMT",
"version": "v2"
},
{
"created": "Thu, 14 Mar 2002 10:10:56 GMT",
"version": "v3"
}
] | 2015-06-25 | [
[
"Fuzfa",
"A.",
""
],
[
"Gerard",
"J. M.",
""
],
[
"Lambert",
"D.",
""
]
] | The Lemaitre and Schwarzschild analytical solutions for a relativistic spherical body of constant density are linked together through the use of the Weyl quadratic invariant. The critical radius for gravitational collapse of an incompressible fluid is shown to vary continuously from 9/8 of the Schwarzschild radius to t... |
1801.08359 | Patryk Mach | Patryk Mach and Jerzy Knopik | Rotating Bowen-York initial data with a positive cosmological constant | 24 pages, 9 figures | null | 10.1088/1361-6382/aac585 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A generalization of the Bowen-York initial data to the case with a positive
cosmological constant is investigated. We follow the construction presented
recently by Bizo\'n, Pletka and Simon, and solve numerically the Lichnerowicz
equation on a compactified domain $\mathbb S^1 \times \mathbb S^2$. In addition
to two b... | [
{
"created": "Thu, 25 Jan 2018 11:25:25 GMT",
"version": "v1"
}
] | 2018-07-11 | [
[
"Mach",
"Patryk",
""
],
[
"Knopik",
"Jerzy",
""
]
] | A generalization of the Bowen-York initial data to the case with a positive cosmological constant is investigated. We follow the construction presented recently by Bizo\'n, Pletka and Simon, and solve numerically the Lichnerowicz equation on a compactified domain $\mathbb S^1 \times \mathbb S^2$. In addition to two bra... |
gr-qc/9508019 | Andrei Linde | Andrei Linde | Quantum Cosmology and the Structure of Inflationary Universe | 43 pages, LaTeX, Invited talk at the joint Johns Hopkins Workshop -
PASCOS meeting, Baltimore, 1995 | null | null | SU-ITP-95-15 | gr-qc astro-ph hep-ph hep-th | null | In this review I consider several different issues related to inflation. I
will begin with the wave function of the Universe. This issue is pretty old,
but recently there were some new insights based on the theory of the
self-reproducing inflationary universe. Then we will discuss stationarity of
inflationary univers... | [
{
"created": "Tue, 8 Aug 1995 02:08:11 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Linde",
"Andrei",
""
]
] | In this review I consider several different issues related to inflation. I will begin with the wave function of the Universe. This issue is pretty old, but recently there were some new insights based on the theory of the self-reproducing inflationary universe. Then we will discuss stationarity of inflationary universe ... |
gr-qc/0002091 | Valerio Faraoni | Valerio Faraoni (Universite' Libre de Bruxelles) | Inflation and quintessence with nonminimal coupling | 36 pages, LaTeX. Typos in Eq. (2.5) corrected | Phys.Rev.D62:023504,2000 | 10.1103/PhysRevD.62.023504 | null | gr-qc astro-ph hep-th | null | The nonminimal coupling (NMC) of the scalar field to the Ricci curvature is
unavoidable in many cosmological scenarios. Inflation and quintessence models
based on nonminimally coupled scalar fields are studied, with particular
attention to the balance between the scalar potential and the NMC term in the
action. NMC m... | [
{
"created": "Sat, 26 Feb 2000 15:00:58 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Apr 2000 08:16:10 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Faraoni",
"Valerio",
"",
"Universite' Libre de Bruxelles"
]
] | The nonminimal coupling (NMC) of the scalar field to the Ricci curvature is unavoidable in many cosmological scenarios. Inflation and quintessence models based on nonminimally coupled scalar fields are studied, with particular attention to the balance between the scalar potential and the NMC term in the action. NMC mak... |
2312.07017 | Jing Tan | Jing Tan and Baoxiang Wang | Constraints on Brans-Dicke gravity from neutron star-black hole merger
events using higher harmonics | 8 pages, 2 figures, 2 tables | Phys.Rev.D 109 (2024) 8, 084036 | 10.1103/PhysRevD.109.084036 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we derive a 90\% credible lower bound on the modified
parameter of scalar-tensor theories as $\varphi_{-2}>-7.94\times10^{-4}$ by
using dominant-mode correction. Specific to BD theory, we have the constraint
$\omega_{\rm BD}>4.75$. Asymmetric binary systems usually have a significant
mass ratio; in suc... | [
{
"created": "Tue, 12 Dec 2023 07:08:53 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Apr 2024 14:22:21 GMT",
"version": "v2"
},
{
"created": "Sun, 28 Apr 2024 17:45:25 GMT",
"version": "v3"
}
] | 2024-04-30 | [
[
"Tan",
"Jing",
""
],
[
"Wang",
"Baoxiang",
""
]
] | In this paper, we derive a 90\% credible lower bound on the modified parameter of scalar-tensor theories as $\varphi_{-2}>-7.94\times10^{-4}$ by using dominant-mode correction. Specific to BD theory, we have the constraint $\omega_{\rm BD}>4.75$. Asymmetric binary systems usually have a significant mass ratio; in such ... |
0911.2064 | Antoine Folacci | Antoine Folacci | BRST quantization of the massless minimally coupled scalar field in de
Sitter space (zero modes, euclideanization and quantization) | This paper has been published under the title "Zero modes,
euclideanization and quantization" [Phys. Rev. D46, 2553 (1992)] | Phys.Rev.D46:2553-2559,1992 | 10.1103/PhysRevD.46.2553 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the massless scalar field on the four-dimensional sphere $S^4$.
Its classical action $S={1\over 2}\int_{S^4} dV (\nabla \phi)^2$ is degenerate
under the global invariance $\phi \to \phi + \hbox{constant}$. We then quantize
the massless scalar field as a gauge theory by constructing a BRST-invariant
quantu... | [
{
"created": "Wed, 11 Nov 2009 16:27:42 GMT",
"version": "v1"
}
] | 2010-04-21 | [
[
"Folacci",
"Antoine",
""
]
] | We consider the massless scalar field on the four-dimensional sphere $S^4$. Its classical action $S={1\over 2}\int_{S^4} dV (\nabla \phi)^2$ is degenerate under the global invariance $\phi \to \phi + \hbox{constant}$. We then quantize the massless scalar field as a gauge theory by constructing a BRST-invariant quantum ... |
1603.01117 | Etera R. Livine | Christoph Charles and Etera R. Livine | The Fock Space of Loopy Spin Networks for Quantum Gravity | 53 pages, all figures in tikz (v2: typo corrected in eqn 135-136) | General Relativity and Gravitation, August 2016, 48:113 | 10.1007/s10714-016-2107-5 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of the coarse-graining of loop quantum gravity, we introduce
loopy and tagged spin networks, which generalize the standard spin network
states to account explicitly for non-trivial curvature and torsion. Both
structures relax the closure constraints imposed at the spin network vertices.
While tagged sp... | [
{
"created": "Thu, 3 Mar 2016 14:59:18 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Mar 2016 12:48:34 GMT",
"version": "v2"
}
] | 2016-08-11 | [
[
"Charles",
"Christoph",
""
],
[
"Livine",
"Etera R.",
""
]
] | In the context of the coarse-graining of loop quantum gravity, we introduce loopy and tagged spin networks, which generalize the standard spin network states to account explicitly for non-trivial curvature and torsion. Both structures relax the closure constraints imposed at the spin network vertices. While tagged spin... |
gr-qc/0503034 | Vicente Jos\'e Bol\'os | V. J. Bolos, V. Liern, J. Olivert | Relativistic simultaneity and causality | 12 pages, 5 figures. This is a totally revised version of the paper
of same title | Int.J.Theor.Phys. 41:1007-1018,2002 | 10.1023/A:1016079025682 | null | gr-qc | null | We analyze two types of relativistic simultaneity associated to an observer:
the spacelike simultaneity, given by Landau submanifolds, and the lightlike
simultaneity (also known as observed simultaneity), given by past-pointing
horismos submanifolds. We study some geometrical conditions to ensure that
Landau submanif... | [
{
"created": "Wed, 9 Mar 2005 15:13:52 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Bolos",
"V. J.",
""
],
[
"Liern",
"V.",
""
],
[
"Olivert",
"J.",
""
]
] | We analyze two types of relativistic simultaneity associated to an observer: the spacelike simultaneity, given by Landau submanifolds, and the lightlike simultaneity (also known as observed simultaneity), given by past-pointing horismos submanifolds. We study some geometrical conditions to ensure that Landau submanifol... |
1612.01299 | Salvatore Capozziello | Sebastian Bahamonde, and Salvatore Capozziello | Noether Symmetry Approach in $f(T,B)$ teleparallel cosmology | 21 pages | null | 10.1140/epjc/s10052-017-4677-0 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the cosmology derived from $f(T,B)$ gravity where $T$ is the
torsion scalar and $B=\frac{2}{e}\partial_{\mu}(e T^{\mu})$ a boundary term. In
particular we discuss how it is possible to recover, under the same standard,
the teleparallel $f(T)$ gravity, the curvature $f(R)$ gravity and the
teleparallel-curv... | [
{
"created": "Mon, 5 Dec 2016 10:29:43 GMT",
"version": "v1"
}
] | 2017-03-08 | [
[
"Bahamonde",
"Sebastian",
""
],
[
"Capozziello",
"Salvatore",
""
]
] | We consider the cosmology derived from $f(T,B)$ gravity where $T$ is the torsion scalar and $B=\frac{2}{e}\partial_{\mu}(e T^{\mu})$ a boundary term. In particular we discuss how it is possible to recover, under the same standard, the teleparallel $f(T)$ gravity, the curvature $f(R)$ gravity and the teleparallel-curvat... |
1109.5858 | Burkhard Kleihaus | Burkhard Kleihaus, Jutta Kunz and Stefanie Schneider | Stable Phases of Boson Stars | 18 pages, 14 figures | null | 10.1103/PhysRevD.85.024045 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the physical properties of boson stars, which possess counterparts
in flat space-time, Q-balls. Applying a stability analysis via catastrophe
theory, we show that the families of rotating and non-rotating boson stars
exhibit two stable regions, separated by an unstable region. Analogous to the
case of whit... | [
{
"created": "Tue, 27 Sep 2011 12:28:23 GMT",
"version": "v1"
}
] | 2013-05-30 | [
[
"Kleihaus",
"Burkhard",
""
],
[
"Kunz",
"Jutta",
""
],
[
"Schneider",
"Stefanie",
""
]
] | We analyze the physical properties of boson stars, which possess counterparts in flat space-time, Q-balls. Applying a stability analysis via catastrophe theory, we show that the families of rotating and non-rotating boson stars exhibit two stable regions, separated by an unstable region. Analogous to the case of white ... |
2201.06558 | David Brown | J. David Brown | Singular Lagrangians, Constrained Hamiltonian Systems and Gauge
Invariance: An Example of the Dirac-Bergmann Algorithm | Final Version | Universe 2022, 8(3), 171 | 10.3390/universe8030171 | null | gr-qc hep-th math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | The Dirac-Bergmann algorithm is a recipe for converting a theory with a
singular Lagrangian into a constrained Hamiltonian system. Constrained
Hamiltonian systems include gauge theories -- general relativity,
electromagnetism, Yang Mills, string theory, etc. The Dirac-Bergmann algorithm
is elegant but at the same tim... | [
{
"created": "Mon, 17 Jan 2022 18:25:38 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Jan 2022 23:20:33 GMT",
"version": "v2"
},
{
"created": "Wed, 9 Mar 2022 14:27:44 GMT",
"version": "v3"
}
] | 2022-03-10 | [
[
"Brown",
"J. David",
""
]
] | The Dirac-Bergmann algorithm is a recipe for converting a theory with a singular Lagrangian into a constrained Hamiltonian system. Constrained Hamiltonian systems include gauge theories -- general relativity, electromagnetism, Yang Mills, string theory, etc. The Dirac-Bergmann algorithm is elegant but at the same time ... |
2403.08400 | Alexander Kamenshchik | Alexander Kamenshchik and Polina Petriakova | Regular Friedmann Universes and Matter Transformations | 11 pages, 2 figures | Published in Universe, 10 (3) 137 (2024), Special Issue "The
Friedmann Cosmology: A Century Later" | 10.3390/universe10030137 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We apply a very simple procedure to construct non-singular cosmological
models for flat Friedmann universes filled with minimally coupled scalar fields
or by tachyon Born-Infeld-type fields. Remarkably, for the minimally coupled
scalar field and the tachyon field, the regularity of the cosmological
evolution, or in o... | [
{
"created": "Wed, 13 Mar 2024 10:28:48 GMT",
"version": "v1"
}
] | 2024-03-14 | [
[
"Kamenshchik",
"Alexander",
""
],
[
"Petriakova",
"Polina",
""
]
] | We apply a very simple procedure to construct non-singular cosmological models for flat Friedmann universes filled with minimally coupled scalar fields or by tachyon Born-Infeld-type fields. Remarkably, for the minimally coupled scalar field and the tachyon field, the regularity of the cosmological evolution, or in oth... |
0902.0307 | Stephen Fairhurst | Benjamin Farr, Stephen Fairhurst, B.S. Sathyaprakash | Searching for binary coalescences with inspiral templates: Detection and
parameter estimation | 14 pages, submitted to proceedings of the NRDA08 meeting, Syracuse,
Aug. 11-14, 2008 | Class.Quant.Grav.26:114009,2009 | 10.1088/0264-9381/26/11/114009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There has been remarkable progress in numerical relativity recently. This has
led to the generation of gravitational waveform signals covering what has been
traditionally termed the three phases of the coalescence of a compact binary -
the inspiral, merger and ringdown. In this paper, we examine the usefulness of
ins... | [
{
"created": "Mon, 2 Feb 2009 15:50:50 GMT",
"version": "v1"
}
] | 2009-06-10 | [
[
"Farr",
"Benjamin",
""
],
[
"Fairhurst",
"Stephen",
""
],
[
"Sathyaprakash",
"B. S.",
""
]
] | There has been remarkable progress in numerical relativity recently. This has led to the generation of gravitational waveform signals covering what has been traditionally termed the three phases of the coalescence of a compact binary - the inspiral, merger and ringdown. In this paper, we examine the usefulness of inspi... |
1909.08698 | Pedro Moraes | M.M. Lapola, P.H.R.S. Moraes, W. de Paula, J. F. Jesus, R. Valentim,
M. Malheiro | A unique equation of state for the universe evolution from AdS$_5$
space-time | 14 pages, 11 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply the Induced Matter Model to a five-dimensional metric. For the case
with null cosmological constant, we obtain a solution able to describe the
radiation-dominated era of the universe. The positive $\Lambda$ case yields a
bounce cosmological model. In the negative five-dimensional cosmological
constant case, ... | [
{
"created": "Wed, 18 Sep 2019 20:47:17 GMT",
"version": "v1"
}
] | 2019-09-20 | [
[
"Lapola",
"M. M.",
""
],
[
"Moraes",
"P. H. R. S.",
""
],
[
"de Paula",
"W.",
""
],
[
"Jesus",
"J. F.",
""
],
[
"Valentim",
"R.",
""
],
[
"Malheiro",
"M.",
""
]
] | We apply the Induced Matter Model to a five-dimensional metric. For the case with null cosmological constant, we obtain a solution able to describe the radiation-dominated era of the universe. The positive $\Lambda$ case yields a bounce cosmological model. In the negative five-dimensional cosmological constant case, th... |
gr-qc/0610018 | Max Niedermaier | M. Niedermaier | The Asymptotic Safety Scenario in Quantum Gravity -- An Introduction | 77p, 1 figure; v2: revised and updated; discussion of perturbation
theory in higher derivative theories extended. To appear as topical review in
CQG | Class.Quant.Grav.24:R171-230,2007 | 10.1088/0264-9381/24/18/R01 | null | gr-qc | null | The asymptotic safety scenario in quantum gravity is reviewed, according to
which a renormalizable quantum theory of the gravitational field is feasible
which reconciles asymptotically safe couplings with unitarity. All presently
known evidence is surveyed: (a) from the 2+\eps expansion, (b) from the
perturbation the... | [
{
"created": "Thu, 5 Oct 2006 10:09:13 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Jul 2007 09:51:40 GMT",
"version": "v2"
}
] | 2010-11-02 | [
[
"Niedermaier",
"M.",
""
]
] | The asymptotic safety scenario in quantum gravity is reviewed, according to which a renormalizable quantum theory of the gravitational field is feasible which reconciles asymptotically safe couplings with unitarity. All presently known evidence is surveyed: (a) from the 2+\eps expansion, (b) from the perturbation theor... |
2006.06190 | Raihaneh Moti | R. Moti and A. Shojai (Tehran U.) | Traversability of quantum improved wormhole solution | 23 pages, 8 Figures | Phys.Rev. D101 (2020) no.12, 124042 | 10.1103/PhysRevD.101.124042 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have investigated the problem of traversability of wormholes in the
framework of quantum improvement of gravity theory arising from functional
renormalization group methods to describe the asymptotic safe quantum gravity.
We have shown that improved pseudospherical wormholes could be traversable with
non--exotic m... | [
{
"created": "Thu, 11 Jun 2020 04:47:40 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Jun 2020 15:09:14 GMT",
"version": "v2"
}
] | 2020-07-14 | [
[
"Moti",
"R.",
"",
"Tehran U."
],
[
"Shojai",
"A.",
"",
"Tehran U."
]
] | We have investigated the problem of traversability of wormholes in the framework of quantum improvement of gravity theory arising from functional renormalization group methods to describe the asymptotic safe quantum gravity. We have shown that improved pseudospherical wormholes could be traversable with non--exotic mat... |
gr-qc/9610043 | Peter Leifer | Peter Leifer | Quantum theory requires gravity and superrelativity | 18 pages, Abstract, Proceeding of the Conference `Quantum Structure
'96, Berlin (1996) | null | null | TAUP 2357-1966 | gr-qc | null | The ordinary quantum theory points out that general relativity is negligible
for spatial distances up to the Planck scale. Consistency in the foundations of
the quantum theory requires a``soft'' spacetime structure of the general
relativity at essentially longer length. However, for some reasons this appears
to be no... | [
{
"created": "Sun, 20 Oct 1996 21:02:31 GMT",
"version": "v1"
}
] | 2012-09-13 | [
[
"Leifer",
"Peter",
""
]
] | The ordinary quantum theory points out that general relativity is negligible for spatial distances up to the Planck scale. Consistency in the foundations of the quantum theory requires a``soft'' spacetime structure of the general relativity at essentially longer length. However, for some reasons this appears to be not ... |
1706.01753 | Singh Ibungochouba Telem | T. Ibungochouba Singh, I. Ablu Meitei and K. Yugindro Singh | Quantum gravity effects on Hawking radiation of Schwarzschild-de Sitter
black holes | Accepted in International Journal of Theoretical Physics | null | null | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The correction of Hawking temperature of Schwarzschild-de Sitter (SdS) black
hole is investigated using the generalized Klein-Gordon equation and the
generalized Dirac equation by taking the quantum gravity effects into account.
We derive the corrected Hawking temperatures for scalar particles and fermions
crossing t... | [
{
"created": "Sat, 3 Jun 2017 10:59:22 GMT",
"version": "v1"
}
] | 2017-06-07 | [
[
"Singh",
"T. Ibungochouba",
""
],
[
"Meitei",
"I. Ablu",
""
],
[
"Singh",
"K. Yugindro",
""
]
] | The correction of Hawking temperature of Schwarzschild-de Sitter (SdS) black hole is investigated using the generalized Klein-Gordon equation and the generalized Dirac equation by taking the quantum gravity effects into account. We derive the corrected Hawking temperatures for scalar particles and fermions crossing the... |
2408.05893 | Nicolas R. Bertini | Nicolas R. Bertini | Scale-dependent gravity and covariant scale-setting | 17 pages | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | A fundamental element of scale-dependent gravity is the scale-setting
procedure. We present a new covariant expression to set the scale that arises
when examining the field equations. Considering the renormalization group
equations and imposing energy-momentum tensor conservation, we arrive at two
models of running o... | [
{
"created": "Mon, 12 Aug 2024 02:11:20 GMT",
"version": "v1"
}
] | 2024-08-13 | [
[
"Bertini",
"Nicolas R.",
""
]
] | A fundamental element of scale-dependent gravity is the scale-setting procedure. We present a new covariant expression to set the scale that arises when examining the field equations. Considering the renormalization group equations and imposing energy-momentum tensor conservation, we arrive at two models of running of ... |
1512.03227 | Kemal G\"ultekin | Kemal Gultekin | Affine Dynamics with Torsion | 25 pages, typos corrected | Eur. Phys. J. C (2016) 76:164 | 10.1140/epjc/s10052-016-4015-y | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this study, we give a thorough analysis of a general affine gravity with
torsion. After a brief exposition of the affine gravities considered by
Eddington and Schr\"{o}dinger, we construct and analyze different affine
gravities based on the determinants of the Ricci tensor, the torsion tensor,
the Riemann tensor a... | [
{
"created": "Thu, 10 Dec 2015 12:16:10 GMT",
"version": "v1"
},
{
"created": "Sun, 3 Apr 2016 00:48:23 GMT",
"version": "v2"
}
] | 2016-04-05 | [
[
"Gultekin",
"Kemal",
""
]
] | In this study, we give a thorough analysis of a general affine gravity with torsion. After a brief exposition of the affine gravities considered by Eddington and Schr\"{o}dinger, we construct and analyze different affine gravities based on the determinants of the Ricci tensor, the torsion tensor, the Riemann tensor and... |
gr-qc/0410040 | Chi Wai Lai | Chi-Wai Lai | A Numerical Study of Boson Stars | 168 pages, 54 figures, PhD Thesis. Positions of figures were
misplaced For a high resolution version, see
http://laplace.physics.ubc.ca/People/cwlai/papers/papers.html For | null | null | null | gr-qc | null | We present a numerical study of general relativistic boson stars in both
spherical symmetry and axisymmetry. We consider both time-independent problems,
involving the solution of equilibrium equations for rotating boson stars, and
time-dependent problems, focusing on black hole critical behaviour associated
with boso... | [
{
"created": "Fri, 8 Oct 2004 14:30:20 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Oct 2004 13:29:40 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Lai",
"Chi-Wai",
""
]
] | We present a numerical study of general relativistic boson stars in both spherical symmetry and axisymmetry. We consider both time-independent problems, involving the solution of equilibrium equations for rotating boson stars, and time-dependent problems, focusing on black hole critical behaviour associated with boson ... |
gr-qc/0201037 | Jan Czerniawski | J. Czerniawski | What is wrong with Schwarzschild's coordinates? | LaTeX, 4 1/2 pages; the order of assumptions changed and new
references added | Concepts Phys. 3 (2006) 307-318 | null | null | gr-qc | null | A strict derivation of the Schwarzschild metric, based solely on Newton's law
of free fall and the equivalence principle, is presented. In the light of it,
regarding Schwarzschild's coordinates as representing the point of view of a
distant observer resting relative to the source of a centrally symmetric
gravitationa... | [
{
"created": "Fri, 11 Jan 2002 08:16:31 GMT",
"version": "v1"
},
{
"created": "Sat, 12 Jan 2002 15:06:15 GMT",
"version": "v2"
},
{
"created": "Wed, 11 Sep 2002 14:23:52 GMT",
"version": "v3"
},
{
"created": "Fri, 12 Nov 2004 12:03:19 GMT",
"version": "v4"
}
] | 2007-05-23 | [
[
"Czerniawski",
"J.",
""
]
] | A strict derivation of the Schwarzschild metric, based solely on Newton's law of free fall and the equivalence principle, is presented. In the light of it, regarding Schwarzschild's coordinates as representing the point of view of a distant observer resting relative to the source of a centrally symmetric gravitational ... |
1304.8106 | Tim Johannsen | Tim Johannsen (Waterloo, CITA, Perimeter) | Inner Accretion Disk Edges in a Kerr-Like Spacetime | 13 pages, 10 figures, accepted for publication in PRD, published
version | null | 10.1103/PhysRevD.87.124010 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | According to the no-hair theorem, astrophysical black holes are uniquely
described by the Kerr metric. In order to test this theorem with observations
in either the electromagnetic or gravitational-wave spectra, several Kerr-like
spacetimes have been constructed which describe potential deviations from the
Kerr space... | [
{
"created": "Tue, 30 Apr 2013 18:36:57 GMT",
"version": "v1"
},
{
"created": "Thu, 2 May 2013 18:57:42 GMT",
"version": "v2"
},
{
"created": "Fri, 24 May 2013 13:37:34 GMT",
"version": "v3"
},
{
"created": "Thu, 6 Jun 2013 14:04:23 GMT",
"version": "v4"
}
] | 2015-06-15 | [
[
"Johannsen",
"Tim",
"",
"Waterloo, CITA, Perimeter"
]
] | According to the no-hair theorem, astrophysical black holes are uniquely described by the Kerr metric. In order to test this theorem with observations in either the electromagnetic or gravitational-wave spectra, several Kerr-like spacetimes have been constructed which describe potential deviations from the Kerr spaceti... |
1712.10268 | Alan Kostelecky | Alan Kostelecky, Matthew Mewes | Lorentz and Diffeomorphism Violations in Linearized Gravity | 17 pages | Phys.Lett.B779: 136-142, 2018 | 10.1016/j.physletb.2018.01.082 | IUHET 626 | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Lorentz and diffeomorphism violations are studied in linearized gravity using
effective field theory. A classification of all gauge-invariant and
gauge-violating terms is given. The exact covariant dispersion relation for
gravitational modes involving operators of arbitrary mass dimension is
constructed, and various ... | [
{
"created": "Fri, 29 Dec 2017 16:20:20 GMT",
"version": "v1"
}
] | 2018-02-23 | [
[
"Kostelecky",
"Alan",
""
],
[
"Mewes",
"Matthew",
""
]
] | Lorentz and diffeomorphism violations are studied in linearized gravity using effective field theory. A classification of all gauge-invariant and gauge-violating terms is given. The exact covariant dispersion relation for gravitational modes involving operators of arbitrary mass dimension is constructed, and various sp... |
2005.10268 | Shahar Hod | Shahar Hod | Reissner-Nordstr\"om black holes supporting non-minimally coupled
massive scalar field configurations | 7 pages | Physical Review D 101, 104025 (2020) | 10.1103/PhysRevD.101.104025 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has recently been demonstrated that static spatially regular scalar
fields, which are non-minimally coupled to the electromagnetic field of a
charged central black hole, can be supported in the exterior regions of the
black-hole spacetime. In the present paper we use {\it analytical} techniques
in order to study t... | [
{
"created": "Wed, 20 May 2020 18:00:09 GMT",
"version": "v1"
}
] | 2020-05-27 | [
[
"Hod",
"Shahar",
""
]
] | It has recently been demonstrated that static spatially regular scalar fields, which are non-minimally coupled to the electromagnetic field of a charged central black hole, can be supported in the exterior regions of the black-hole spacetime. In the present paper we use {\it analytical} techniques in order to study the... |
2104.02067 | D. C. Robinson | D. C. Robinson | Spinorial coordinates for Lorentzian 4-metrics | Equations added. Final section re-written | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Lorentzian 4-metrics are expressed in spinorial coordinates. In these
coordinates the metric components can be factorized into a product of complex
conjugate quantities. The linearized theory and Einstein's vacuum field
equations are studied using these coordinates. The relationship between
Lorentzian and complex 4-m... | [
{
"created": "Mon, 5 Apr 2021 16:03:14 GMT",
"version": "v1"
},
{
"created": "Sun, 10 Oct 2021 14:58:07 GMT",
"version": "v2"
}
] | 2021-10-12 | [
[
"Robinson",
"D. C.",
""
]
] | Lorentzian 4-metrics are expressed in spinorial coordinates. In these coordinates the metric components can be factorized into a product of complex conjugate quantities. The linearized theory and Einstein's vacuum field equations are studied using these coordinates. The relationship between Lorentzian and complex 4-met... |
gr-qc/0307050 | Niall \'O Murchadha | Niall \'O Murchadha, Krzysztof Roszkowski | Embedding spherical spacelike slices in a Schwarzschild solution | null | Class.Quant.Grav. 23 (2006) 539-548 | 10.1088/0264-9381/23/2/017 | null | gr-qc | null | Given a spherical spacelike three-geometry, there exists a very simple
algebraic condition which tells us whether, and in which, Schwarzschild
solution this geometry can be smoothly embedded. One can use this result to
show that any given Schwarzschild solution covers a significant subset of
spherical superspace and ... | [
{
"created": "Thu, 10 Jul 2003 13:42:15 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Murchadha",
"Niall Ó",
""
],
[
"Roszkowski",
"Krzysztof",
""
]
] | Given a spherical spacelike three-geometry, there exists a very simple algebraic condition which tells us whether, and in which, Schwarzschild solution this geometry can be smoothly embedded. One can use this result to show that any given Schwarzschild solution covers a significant subset of spherical superspace and th... |
1205.3481 | Manuel Rodrigues | Manuel E. Rodrigues, Deborah F. Jardim, M. J. S. Houndjo and Ratbay
Myrzakulov | Thermodynamics of black plane solution | 19 pages, 3 figures, version accepted for publication in General
Relativity and Gravitation | General Relativity and Gravitation, v.45, N11, 2309-2323 (2013) | 10.1007/s10714-013-1585-y | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain a new phantom black plane solution in 4D of the Einstein-Maxwell
theory coupled with a cosmological constant. We analyse their basic properties,
as well as its causal structure, and obtain the extensive and intensive
thermodynamic variables, as well as the specific heat and the first law.
Through the specif... | [
{
"created": "Tue, 15 May 2012 19:38:05 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Nov 2012 11:52:00 GMT",
"version": "v2"
},
{
"created": "Mon, 12 Aug 2013 23:56:13 GMT",
"version": "v3"
}
] | 2013-10-30 | [
[
"Rodrigues",
"Manuel E.",
""
],
[
"Jardim",
"Deborah F.",
""
],
[
"Houndjo",
"M. J. S.",
""
],
[
"Myrzakulov",
"Ratbay",
""
]
] | We obtain a new phantom black plane solution in 4D of the Einstein-Maxwell theory coupled with a cosmological constant. We analyse their basic properties, as well as its causal structure, and obtain the extensive and intensive thermodynamic variables, as well as the specific heat and the first law. Through the specific... |
2401.10410 | Piyabut Burikham | Muhammad F. A. R. Sakti, Piyabut Burikham, Tiberiu Harko | Thermodynamics of the Weyl Geometric Gravity Black Holes | 19 pages, 14 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by-sa/4.0/ | We consider the thermodynamic properties of an exact black hole solution
obtained in Weyl geometric gravity theory, by considering the simplest
conformally invariant action, constructed from the square of the Weyl scalar,
and the strength of the Weyl vector only. The action is linearized in the Weyl
scalar by introdu... | [
{
"created": "Thu, 18 Jan 2024 22:37:22 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Aug 2024 16:52:58 GMT",
"version": "v2"
}
] | 2024-08-05 | [
[
"Sakti",
"Muhammad F. A. R.",
""
],
[
"Burikham",
"Piyabut",
""
],
[
"Harko",
"Tiberiu",
""
]
] | We consider the thermodynamic properties of an exact black hole solution obtained in Weyl geometric gravity theory, by considering the simplest conformally invariant action, constructed from the square of the Weyl scalar, and the strength of the Weyl vector only. The action is linearized in the Weyl scalar by introduci... |
1503.04197 | Dr. Sudhaker Upadhyay | Sudhaker Upadhyay | Field-dependent symmetries in Friedmann-Robertson-Walker models | 7 pages, No figure, Accepted in Annals of Physics (Journal version) | Annals of Physics 356 (2015) 299-305 | 10.1016/j.aop.2015.03.002 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider effective actions of the cosmological Friedmann-Robertson-Walker
(FRW) models and discuss their fermionic rigid BRST invariance. Further, we
demonstrate the finite field-dependent BRST transformations as a limiting case
of continuous field-dependent BRST transformations described in terms of
continuous pa... | [
{
"created": "Fri, 13 Mar 2015 10:04:31 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Mar 2015 11:45:55 GMT",
"version": "v2"
}
] | 2015-04-02 | [
[
"Upadhyay",
"Sudhaker",
""
]
] | We consider effective actions of the cosmological Friedmann-Robertson-Walker (FRW) models and discuss their fermionic rigid BRST invariance. Further, we demonstrate the finite field-dependent BRST transformations as a limiting case of continuous field-dependent BRST transformations described in terms of continuous para... |
gr-qc/9501009 | Sardanashvily Gennadi | G.Sardanashvily (Dept of Theoretical Physics, Moscow State Univ) | Energy-Momentum Conservation Laws in Affine-Metric Gravitation Theory | 20 pp, LaTeX file | null | null | TP\95\001 | gr-qc | null | The Lagrangian formulation of field theory does not provide any universal
energy-momentum conservation law in order to analize that in gravitation
theory. In Lagrangian field theory, we get different identities involving
different stress energy-momentum tensors which however are not conserved,
otherwise in the covari... | [
{
"created": "Tue, 10 Jan 1995 01:11:37 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Sardanashvily",
"G.",
"",
"Dept of Theoretical Physics, Moscow State Univ"
]
] | The Lagrangian formulation of field theory does not provide any universal energy-momentum conservation law in order to analize that in gravitation theory. In Lagrangian field theory, we get different identities involving different stress energy-momentum tensors which however are not conserved, otherwise in the covarian... |
gr-qc/0201030 | null | John C. Baez and S. Jay Olson | Uncertainty in Measurements of Distance | 5 pages LaTeX | Class.Quant.Grav.19:L121-L126,2002 | 10.1088/0264-9381/19/14/101 | null | gr-qc | null | Ng and van Dam have argued that quantum theory and general relativity give a
lower bound of L^{1/3} L_P^{2/3} on the uncertainty of any distance, where L is
the distance to be measured and L_P is the Planck length. Their idea is roughly
that to minimize the position uncertainty of a freely falling measuring device
on... | [
{
"created": "Wed, 9 Jan 2002 23:39:18 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Baez",
"John C.",
""
],
[
"Olson",
"S. Jay",
""
]
] | Ng and van Dam have argued that quantum theory and general relativity give a lower bound of L^{1/3} L_P^{2/3} on the uncertainty of any distance, where L is the distance to be measured and L_P is the Planck length. Their idea is roughly that to minimize the position uncertainty of a freely falling measuring device one ... |
2304.13603 | Misbah Shahzadi | Martin Kolo\v{s}, Misbah Shahzadi, Arman Tursunov | Charged particle dynamics in parabolic magnetosphere around
Schwarzschild black hole | 23 pages, 16 figures | Eur. Phys. J. C (2023) 83:323 | 10.1140/epjc/s10052-023-11498-8 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | The study of charged particle dynamics in the combined gravitational and
magnetic field can provide important theoretical insight into astrophysical
processes around black holes. In this paper, we explore the charged particle
dynamics in parabolic magnetic field configuration around Schwarzschild black
hole, since th... | [
{
"created": "Wed, 26 Apr 2023 14:57:46 GMT",
"version": "v1"
}
] | 2024-03-19 | [
[
"Kološ",
"Martin",
""
],
[
"Shahzadi",
"Misbah",
""
],
[
"Tursunov",
"Arman",
""
]
] | The study of charged particle dynamics in the combined gravitational and magnetic field can provide important theoretical insight into astrophysical processes around black holes. In this paper, we explore the charged particle dynamics in parabolic magnetic field configuration around Schwarzschild black hole, since the ... |
gr-qc/0510114 | Janusz Garecki Dr. | Janusz Garecki | The averaged tensors of the relative energy-momentum and angular
momentum in general relativity and some their applications | 30 pages, minor changes referring to Kasner universes | Found.Phys.37:341-365,2007 | 10.1007/s10701-007-9107-y | null | gr-qc | null | There exist at least a few different kind of averaging of the differences of
the energy-momentum and angular momentum in normal coordinates {\bf NC(P)}
which give tensorial quantities. The obtained averaged quantities are
equivalent mathematically because they differ only by constant scalar
dimensional factors. One o... | [
{
"created": "Wed, 26 Oct 2005 16:21:23 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Aug 2006 13:43:49 GMT",
"version": "v2"
},
{
"created": "Fri, 8 Sep 2006 10:25:57 GMT",
"version": "v3"
}
] | 2011-08-04 | [
[
"Garecki",
"Janusz",
""
]
] | There exist at least a few different kind of averaging of the differences of the energy-momentum and angular momentum in normal coordinates {\bf NC(P)} which give tensorial quantities. The obtained averaged quantities are equivalent mathematically because they differ only by constant scalar dimensional factors. One of ... |
2309.01548 | Edoardo D'Angelo | Edoardo D'Angelo | Relative Entropy from Coherent States in Black Hole Thermodynamics and
Cosmology | Master Thesis, defended on July 2020 at the University of Genova.
Thesis supervisor: Nicola Pinamonti and Pierantonio Zangh\`i. Results on the
relative entropy for dynamical holes appeared generalised in a subsequent
paper | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The aim of this work is to study the role of relative entropy in the
thermodynamics of black holes and cosmological horizons. We adapt some recent
results on the relative entropy of coherent excitations of the vacuum, to find
the variation of generalised entropy of static and dynamical black holes and
for cosmologica... | [
{
"created": "Mon, 4 Sep 2023 12:01:13 GMT",
"version": "v1"
}
] | 2023-09-06 | [
[
"D'Angelo",
"Edoardo",
""
]
] | The aim of this work is to study the role of relative entropy in the thermodynamics of black holes and cosmological horizons. We adapt some recent results on the relative entropy of coherent excitations of the vacuum, to find the variation of generalised entropy of static and dynamical black holes and for cosmological ... |
1005.5442 | Llu\'is Bel | Ll. Bel | Local cosmology of the solar system | 6 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A time-dependent model of space-time is used to describe the gravitational
field of the sun. This model is a spherically symmetric approximate solution of
Einstein's equations in vacuum. Near the sun it approximates one of the models
derived from the Schwarzschild solution, while at large distances it becomes a
milne... | [
{
"created": "Sat, 29 May 2010 09:22:45 GMT",
"version": "v1"
}
] | 2010-06-01 | [
[
"Bel",
"Ll.",
""
]
] | A time-dependent model of space-time is used to describe the gravitational field of the sun. This model is a spherically symmetric approximate solution of Einstein's equations in vacuum. Near the sun it approximates one of the models derived from the Schwarzschild solution, while at large distances it becomes a milne's... |
0803.2642 | Alessandro Pesci | Alessandro Pesci | On the statistical-mechanical meaning of the Bousso bound | 6 pages. Some editing and the addition of a reference. This version,
ideally corresponding to the published one, contains 4 corrections to it,
with two of them (p.3, line 19 and p.6, line 10 of this version) with
semantic relevance | Class.Quant.Grav.25:125005,2008 | 10.1088/0264-9381/25/12/125005 | null | gr-qc cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Bousso entropy bound, in its generalized form, is investigated for the
case of perfect fluids at local thermodynamic equilibrium and evidence is found
that the bound is satisfied if and only if a certain local thermodynamic
property holds, emerging when the attempt is made to apply the bound to thin
layers of mat... | [
{
"created": "Tue, 18 Mar 2008 16:10:21 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Jun 2008 09:41:47 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Pesci",
"Alessandro",
""
]
] | The Bousso entropy bound, in its generalized form, is investigated for the case of perfect fluids at local thermodynamic equilibrium and evidence is found that the bound is satisfied if and only if a certain local thermodynamic property holds, emerging when the attempt is made to apply the bound to thin layers of matte... |
2205.01519 | Anna Ijjas | Timo Kist and Anna Ijjas | The robustness of slow contraction and the shape of the scalar field
potential | 23 pages, 7 figures | JCAP 8 (2022) 046 | 10.1088/1475-7516/2022/08/046 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use numerical relativity simulations to explore the conditions for a
canonical scalar field $\phi$ minimally coupled to Einstein gravity to generate
an extended phase of slow contraction that robustly smooths the universe for a
wide range of initial conditions and then sets the conditions for a graceful
exit stage... | [
{
"created": "Tue, 3 May 2022 14:15:01 GMT",
"version": "v1"
}
] | 2022-08-29 | [
[
"Kist",
"Timo",
""
],
[
"Ijjas",
"Anna",
""
]
] | We use numerical relativity simulations to explore the conditions for a canonical scalar field $\phi$ minimally coupled to Einstein gravity to generate an extended phase of slow contraction that robustly smooths the universe for a wide range of initial conditions and then sets the conditions for a graceful exit stage. ... |
0803.3659 | Dah-Wei Chiou | Dah-Wei Chiou | Phenomenological dynamics of loop quantum cosmology in Kantowski-Sachs
spacetime | 36 pages, 4 figures, 1 table; more errors and typos corrected;
version to appear in PRD | Phys.Rev.D78:044019,2008 | 10.1103/PhysRevD.78.044019 | IGC-08/2-4 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The fundamental theory and the semiclassical description of loop quantum
cosmology (LQC) have been studied in the Friedmann-Robertson-Walker and Bianchi
I models. As an extension to include both anisotropy and intrinsic curvature,
this paper investigates the cosmological model of Kantowski-Sachs spacetime
with a free... | [
{
"created": "Wed, 26 Mar 2008 03:01:15 GMT",
"version": "v1"
},
{
"created": "Wed, 14 May 2008 17:37:54 GMT",
"version": "v2"
},
{
"created": "Thu, 3 Jul 2008 21:09:06 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Chiou",
"Dah-Wei",
""
]
] | The fundamental theory and the semiclassical description of loop quantum cosmology (LQC) have been studied in the Friedmann-Robertson-Walker and Bianchi I models. As an extension to include both anisotropy and intrinsic curvature, this paper investigates the cosmological model of Kantowski-Sachs spacetime with a free m... |
1112.2085 | Yongge Ma | Yongge Ma | Extension of Loop Quantum Gravity to Metric Theories beyond General
Relativity | 10 pages; Proceedings of Loops'11, Madrid, submitted to Journal of
Physics: Conference Series | J. Phys.: Conference Series 360 (2012), 012006 | 10.1088/1742-6596/360/1/012006 | null | gr-qc astro-ph.HE hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The successful background-independent quantization of Loop Quantum Gravity
relies on the key observation that classical General Relativity can be cast
into the connection-dynamical formalism with the structure group of SU(2). Due
to this particular formalism, Loop Quantum Gravity was generally considered as
a quantiz... | [
{
"created": "Fri, 9 Dec 2011 12:37:48 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Ma",
"Yongge",
""
]
] | The successful background-independent quantization of Loop Quantum Gravity relies on the key observation that classical General Relativity can be cast into the connection-dynamical formalism with the structure group of SU(2). Due to this particular formalism, Loop Quantum Gravity was generally considered as a quantizat... |
2208.13481 | Kinjalk Lochan | Kinjalk Lochan | Unequal time Commutators in Friedmann universes: Deterministic evolution
of massless fields | Typos fixed, references added; Published in Topical issue of GERG In
Memory of Professor T. Padmanabhan | General Relativity and Gravitation volume 54, Article number: 100
(2022) | 10.1007/s10714-022-02991-8 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze minimally coupled massless scalar field in a Friedmann (FRW)
universe in conformal co-ordinates to model the evolution of tensor
perturbations and study the structure of the Wightman function therein. Using a
duality map from a power law FRW universe to the de Sitter universe for such
fields we obtain uneq... | [
{
"created": "Mon, 29 Aug 2022 10:29:07 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Sep 2022 14:55:49 GMT",
"version": "v2"
}
] | 2022-09-13 | [
[
"Lochan",
"Kinjalk",
""
]
] | We analyze minimally coupled massless scalar field in a Friedmann (FRW) universe in conformal co-ordinates to model the evolution of tensor perturbations and study the structure of the Wightman function therein. Using a duality map from a power law FRW universe to the de Sitter universe for such fields we obtain unequa... |
2404.19493 | Xiao Zhang | Chuxiao Liu, Xiao Zhang | Spherically symmetric Einstein-scalar-field equations for slowly
particle-like decaying null infinity | 17 pages | null | null | null | gr-qc math.DG | http://creativecommons.org/publicdomain/zero/1.0/ | We show that the spherically symmetric Einstein-scalar-field equations for
small slowly particle-like decaying initial data at null infinity have unique
global solutions.
| [
{
"created": "Tue, 30 Apr 2024 12:24:07 GMT",
"version": "v1"
}
] | 2024-05-01 | [
[
"Liu",
"Chuxiao",
""
],
[
"Zhang",
"Xiao",
""
]
] | We show that the spherically symmetric Einstein-scalar-field equations for small slowly particle-like decaying initial data at null infinity have unique global solutions. |
gr-qc/0204033 | Jun'ichi Yokoyama | Jun'ichi Yokoyama | On the origin of the cosmological constant | 5 pages. To be published in the Proc. 11th JGRG ed. by K. Maeda et al | null | null | null | gr-qc | null | Under the assumption that the cosmological constant vanishes in the true
ground state with lowest possible energy density, we argue that the observed
small but finite vacuum-like energy density can be explained if we consider a
theory with two or more degenerate perturbative vacua, which are unstable due
to quantum t... | [
{
"created": "Mon, 8 Apr 2002 02:16:22 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Yokoyama",
"Jun'ichi",
""
]
] | Under the assumption that the cosmological constant vanishes in the true ground state with lowest possible energy density, we argue that the observed small but finite vacuum-like energy density can be explained if we consider a theory with two or more degenerate perturbative vacua, which are unstable due to quantum tun... |
gr-qc/9703072 | Frank Estabrook | Frank B. Estabrook, R. Steve Robinson and Hugo D. Wahlquist (JPL,
Pasadena) | Hyperbolic Equations for Vacuum Gravity Using Special Orthonormal Frames | 14 pages, 3 figures, LaTeX, 13 macros. CQG 14 (1997) 1237-1247 has
algebraic errors. +/- signs in Equations (2), (4) and (5) are here corrected,
and factors of 2 added to Eqs. (18) and (19) | Class.Quant.Grav. 14 (1997) 1237-1247 | 10.1088/0264-9381/14/5/025 | null | gr-qc | null | By adopting Nester's higher dimensional special orthonormal frames (HSOF) the
tetrad equations for vacuum gravity are put into first order symmetric
hyperbolic (FOSH) form with constant coefficients, independent of any time
slicing or coordinate specialization.
| [
{
"created": "Tue, 25 Mar 1997 19:28:51 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Feb 2004 19:17:50 GMT",
"version": "v2"
},
{
"created": "Wed, 29 Sep 2004 23:39:23 GMT",
"version": "v3"
}
] | 2009-10-30 | [
[
"Estabrook",
"Frank B.",
"",
"JPL,\n Pasadena"
],
[
"Robinson",
"R. Steve",
"",
"JPL,\n Pasadena"
],
[
"Wahlquist",
"Hugo D.",
"",
"JPL,\n Pasadena"
]
] | By adopting Nester's higher dimensional special orthonormal frames (HSOF) the tetrad equations for vacuum gravity are put into first order symmetric hyperbolic (FOSH) form with constant coefficients, independent of any time slicing or coordinate specialization. |
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